[ebiester]

It's subtle, but the sheer amount of time that it takes to become a top level GM make it such that there's a bit of "GM Speak" that all of them seem to do. So, there is first a cultural variation: the way he speaks doesn't sound like the rest of the experts. By itself, it isn't damning.

However, people at the GM level also tend to have an ability to look at a position and remember what they were thinking at that point of time. They internalize lines in a way that is a branch of moves. So, in this case Be6! is such a sharp position that you would expect them to talk a bit through it because it takes a lot of prep.

Further, when they turned off Stockfish analysis, his analysis goes down sharply.

Further, he was banned from chess.com twice because he was cheating with an engine.

Further, when he was talking about a set of analysis, he made something up on the spot involving a match between Carlsen and GM Wesley So, and Wesley So said that what he had said was impossible for multiple reasons on another chess streamer's twitch.

It's a lot of little things that don't add up. It's like if you were in an interview and asking a developer to explain some code on their Github about ML, and they sounded like they didn't understand the basic principles of the model they coded. It doesn't mean they didn't write the code, but it casts suspicion.