His claims are his act. Magicians and mentalists all know his act is being in character all the time. Quite a few of them don't like that, and regularly speak out against it. But there is nobody in that circle thinking "well, maybe he actually does have ESP!" like there was during Randi's day.
There is a reason Uri hangs around with magicians and mentalists, and not psychics. He doesn't have psychic powers and doesn't actually lump himself into that category, except as the character we all know of him.
In other news, Teller can actually speak! Consider the similarities, as even though we all know he can speak, he still doesn't go out of character when he is with Penn. We suspend our disbelief knowing that he actually can speak (and many of us have heard him) yet doesn't in that character.
Similarly, [don't read this paragraph if you don't like spoilers] Derren Brown always pretends to explain his mentalism effects. Although his explanations are plausible, and sometimes true for effects where he leaves huge parts unexplained, his explanations are nearly never exactly what he actually did. For example, the Red BMX Bicycle episode - it was straight forward billet work. All the encoding of words was for the TV audience. In "the biz" it is called Dual Reality - the participant and the audience are reacting to slightly different observations.