I’ve just tried in Tor Browser, but I get the same message.
Well, maybe I should try Tor rent :P
Also:
$ yt-dlp https://www.youtube.com/watch?v=6ZVj1_SE4Mo
[youtube] Extracting URL: https://www.youtube.com/watch?v=6ZVj1_SE4Mo
[youtube] 6ZVj1_SE4Mo: Downloading webpage
[youtube] 6ZVj1_SE4Mo: Downloading android player API JSON
ERROR: [youtube] 6ZVj1_SE4Mo: Video unavailable. This video is not available
Nothing special, working and figuring out kitchen to flat, visiting parents, embracing libre software :P