People are getting too hung up on the "500 WPM" part. He's not saying he can type 500 WPM. He's saying that he scored 500 WPM on a specific typing task and he's doing it intentionally. He gets to say he typed 500 WPM and the website that's flagging him as a cheater has to be the one to explain why which just gives him more promotion.

It's not about how fast he's typing. It's about being able to say that his product is significantly faster than everything else.