Some critical bits of info were unintentionally left out with the initial tutorial video.
Most importantly the importance of the Steam collection's visibility, as well as some troubleshooting info that I failed to think about (deleting a bunch of stuff in AppData\SteamCMD\Mods folders, reinstalling SteamCMD)
Also worth further investigation: if Steam needs to be open to use a collection.
Some critical bits of info were unintentionally left out with the initial tutorial video. Most importantly the importance of the Steam collection's visibility, as well as some troubleshooting info that I failed to think about (deleting a bunch of stuff in AppData\SteamCMD\Mods folders, reinstalling SteamCMD)
Also worth further investigation: if Steam needs to be open to use a collection.