https://www.youtube.com/feeds/videos.xml?channel_id=CHANNEL_ID
And without downloading with yt-dlp, videos can be watched from youtube-nocookie.com in full-window mode (no distractions) under: https://cinemaphile.com/watch?v=VIDEO_IDhttps://stackoverflow.com/questions/71192605/how-do-i-get-yo...
https://www.youtube.com/feeds/videos.xml?channel_id=UCS0N5ba...
... works but:
https://www.youtube.com/feeds/videos.xml?channel_id=UULFS0N5...
... is 404.
I'm guessing it's only a feature of playlist URLs which that SO answer is about, not RSS feed URLs.
https://www.youtube.com/feeds/videos.xml?playlist_id=UULFS0N...