Failed to load plugin warnings in Cerbero build for Windows (-v visualstudio)

GStreamer build with Cerbero master with visualstudio, nvcodec and intelmsdk variants enabled.

Win10 x64 Pro 1909
Python 3.8.1 x64
CMake 3.16.2
VS Community 2019 16.4.29613.14

Running gst-launch (or gst-inspect) gives warnings for several DLLs (the two errors are expected):

>gst-launch-1.0.exe

(gst-launch-1.0:12556): GStreamer-WARNING **: 12:59:23.948: Failed to load plugin 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstassrender.dll': 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstassrender.dll': %1 is not a valid Win32 application.

(gst-launch-1.0:12556): GStreamer-WARNING **: 12:59:23.999: Failed to load plugin 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstdashdemux.dll': 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstdashdemux.dll': %1 is not a valid Win32 application.

(gst-launch-1.0:12556): GStreamer-WARNING **: 12:59:24.048: Failed to load plugin 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstges.dll': 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstges.dll': %1 is not a valid Win32 application.
0:00:00.504297000 12556 00000131A3885E40 ERROR                   msdk msdk.c:177:msdk_open_session: Intel Media SDK not available (undeveloped feature)

(gst-launch-1.0:12556): GStreamer-WARNING **: 12:59:24.447: Failed to load plugin 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstsmoothstreaming.dll': 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstsmoothstreaming.dll': %1 is not a valid Win32 application.

(gst-launch-1.0:12556): GStreamer-WARNING **: 12:59:24.473: Failed to load plugin 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstsoup.dll': 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstsoup.dll': %1 is not a valid Win32 application.

(gst-launch-1.0:12556): GStreamer-WARNING **: 12:59:24.523: Failed to load plugin 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstzbar.dll': 'C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0\gstzbar.dll': %1 is not a valid Win32 application.
0:00:00.662751000 12556 00000131A3885E40 ERROR           GST_PIPELINE gst/parse/grammar.y:1162:priv_gst_parse_yyparse: empty pipeline not allowed
ERROR: pipeline could not be constructed: empty pipeline not allowed.

Dumpbin -dependents outputs for the affected DLLs:

C:\Users\T\GStreamer\1.0\x86_64\lib\gstreamer-1.0>C:\22\dumpbin.exe gstassrender.dll -dependents
Microsoft (R) COFF/PE Dumper Version 14.24.28314.0
Copyright (C) Microsoft Corporation.  All rights reserved.


Dump of file gstassrender.dll

File Type: DLL

  Image has the following dependencies:

    gstvideo-1.0-0.dll
    gstreamer-1.0-0.dll
    gobject-2.0-0.dll
    glib-2.0-0.dll
    libass-9.dll
    VCRUNTIME140.dll
    api-ms-win-crt-runtime-l1-1-0.dll
    KERNEL32.dll

  Summary

        1000 .00cfg
        1000 .data
        3000 .idata
        1000 .pdata
        4000 .rdata
        1000 .reloc
        C000 .text

---

Dump of file gstdashdemux.dll

File Type: DLL

  Image has the following dependencies:

    gstadaptivedemux-1.0-0.dll
    gsturidownloader-1.0-0.dll
    gstisoff-1.0-0.dll
    gstbase-1.0-0.dll
    gstreamer-1.0-0.dll
    gobject-2.0-0.dll
    glib-2.0-0.dll
    gsttag-1.0-0.dll
    gstnet-1.0-0.dll
    gio-2.0-0.dll
    libxml2-2.dll
    VCRUNTIME140.dll
    api-ms-win-crt-stdio-l1-1-0.dll
    api-ms-win-crt-string-l1-1-0.dll
    api-ms-win-crt-convert-l1-1-0.dll
    api-ms-win-crt-runtime-l1-1-0.dll
    KERNEL32.dll

  Summary

        1000 .00cfg
        1000 .data
        4000 .idata
        2000 .pdata
        B000 .rdata
        1000 .reloc
       24000 .text

---

Dump of file gstges.dll

File Type: DLL

  Image has the following dependencies:

    ges-1.0-0.dll
    gstreamer-1.0-0.dll
    gobject-2.0-0.dll
    glib-2.0-0.dll
    gstbase-1.0-0.dll
    VCRUNTIME140.dll
    api-ms-win-crt-runtime-l1-1-0.dll
    KERNEL32.dll

  Summary

        1000 .00cfg
        1000 .data
        3000 .idata
        1000 .pdata
        3000 .rdata
        1000 .reloc
        9000 .text

---

Dump of file gstsmoothstreaming.dll

File Type: DLL

  Image has the following dependencies:

    gstadaptivedemux-1.0-0.dll
    gstcodecparsers-1.0-0.dll
    gstisoff-1.0-0.dll
    gstreamer-1.0-0.dll
    gobject-2.0-0.dll
    glib-2.0-0.dll
    intl-8.dll
    gstbase-1.0-0.dll
    libxml2-2.dll
    VCRUNTIME140.dll
    api-ms-win-crt-string-l1-1-0.dll
    api-ms-win-crt-convert-l1-1-0.dll
    api-ms-win-crt-runtime-l1-1-0.dll
    KERNEL32.dll

  Summary

        1000 .00cfg
        1000 .data
        3000 .idata
        1000 .pdata
        4000 .rdata
        1000 .reloc
        B000 .text

---

Dump of file gstsoup.dll

File Type: DLL

  Image has the following dependencies:

    gstreamer-1.0-0.dll
    gobject-2.0-0.dll
    glib-2.0-0.dll
    intl-8.dll
    gstbase-1.0-0.dll
    gsttag-1.0-0.dll
    libsoup-2.4-1.dll
    gio-2.0-0.dll
    VCRUNTIME140.dll
    api-ms-win-crt-convert-l1-1-0.dll
    api-ms-win-crt-runtime-l1-1-0.dll
    KERNEL32.dll

  Summary

        1000 .00cfg
        1000 .data
        4000 .idata
        1000 .pdata
        5000 .rdata
        1000 .reloc
       10000 .text

---

Dump of file gstzbar.dll

File Type: DLL

  Image has the following dependencies:

    gstvideo-1.0-0.dll
    gstbase-1.0-0.dll
    gstreamer-1.0-0.dll
    gobject-2.0-0.dll
    glib-2.0-0.dll
    libzbar-0.dll
    VCRUNTIME140.dll
    api-ms-win-crt-runtime-l1-1-0.dll
    KERNEL32.dll

  Summary

        1000 .00cfg
        1000 .data
        2000 .idata
        1000 .pdata
        2000 .rdata
        1000 .reloc
        6000 .text

I have VC++ runtime redistributables (2005, 2008, 2010, 2012, 2013, 2015-2019; x86 and x64) installed; the 2015-2019 one I've updated today to make sure it's installed properly. Picked 2 DLLs for a quick check, gstzbar.dll and gstsoup.dll: besides the vcredist & system dependencies (vcruntime140.dll, api-ms-*.dll, kernel32.dll), all the needed DLL files seem to exist in the GStreamer folders.

I'm unsure whether this is reliant on -v visualstudio as I don't have a MinGW build to check.