I am quite sure that all the videos on that channel, and many other similar channels, are entirely AI-generated. I had some questions about the channel over here, but no one has answered them yet.
The first few nights [my wife] played them, I marveled at the notion that someone had written and narrated (very professionally) such long videos. It was only a few nights later, when it mispronounced a word (I think it was “live” with a short I instead of a long one, or some such thing) that a real human would never do, that I finally realized, “Oh, this is all AI.”
FWIW, in that portion of the videos I have listened (and paid attention) to, I have not heard anything obviously wrong within the limits of my understanding of the various topics.
Since then I’ve found that there are lots of other similar channels of entirely AI-generated videos for sleeping. To say nothing of all the awful AI slop of other kinds, clogging up YT.
(The putative creator of the site explains how he came to do it in this video, but a comment suggests that that video is also AI! It’s AI all the way down!)