Great, now I give the scripting a chance ...It turns out they are here: /Users/yourhomefoldername/Library/Application Support/com.apple.wallpaper/aerials/videos/ - thanks, reddit.
EDIT: looks like no automation or scripts allows to set these mov as Wallpaper, even MacOS doing this. You can only create a dynamic (static) .heic switching at an individual frame
EDIT2: created a little dynamic heic ...
not the "live" mov's but better than nothing...
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