The problem with Rogan is that he doesn’t have the knowledge or qualifications to push back against people spewing bullshit on his show, and so he ends up essentially making fringe, pseudo-scientific ideas seem equal to the mainstream expert consensus view.
The anecdote proves nothing because the model could potentially have known of the McGonagal character without ever being trained on the books, since that character appears in a lot of fan fiction. So their point is invalid and their anecdote proves nothing.