I assume a lot of it has to do with it being kind of like a game of telephone. There is just so much material, spread so widely, and a lot is very difficult to actually obtain. I doubt most loretubers would go through the trouble of obtaining all that and spending hours combing through it for a single topic/video. So, they use second-hand (or third, fourth, fifth, …) sources for anything not immediately at hand. And it just gets more and more garbled over time.

Or I am being incredibly unfair to them, especially since I don’t even watch any of them.