There is a difference. If he is claiming to be an entertainer, than his job is to entertain, not prove that he is talking to the dead. Agree or disagree with his methods, but he is an entertainer.Well whoop-dee-doo! While we're at it, I'm a general second class of the Intergalactic Heartbreaker Squad.
If he were an entertainer instead of a con man, he would admit that he's not actually channeling a dead guy.
Since he attempts to have his cake and eat it too, he deserves what he got. He humiliated himself on national TV with that ballistic reaction to Criss's challenge, and no one I know takes him seriously as a result. The only people standing up for him are generally those who have a vendetta against Criss.
Secondly, your line about admitting he is not talking to the dead is false. The only person that you have come into contact with is this man when in character. I will repeat that, IN CHARACTER. He is not going to admit he is faking it if he is in character, it would ruin it all.
You have to realize that there is a difference between what a person says when he is in character in front of millions of spectators, and when he is speaking as himself.