The AI generated content on YouTube is often 80% right, as is human generated by some channels, and sounds very plausible (and is sometimes very hard to identify!) - but is presenting hallucinated facts as reality for the other 20%. Quite convincingly too.

It’s in almost all topics now, from the Ukraine War to cooking.

And ancient aliens type stuff is all over the place - UFOs, pyramids, gov’t conspiracies of various forms, etc.

Not just YouTube of course, but very visible there.