Long time, no post...
In my opinion, there is no doubt in my mind that it is Ben Folds.
1) He looks like him.
2) He goes at length to disguise his appearance.
3) His voice sounds like he would unmic'd
4) His playing style is the same.
5) His lyrical/improv style is very similar.
His laugh at the end really gives it away too...
But outside of this forum, the secret's safe with me. I think it's more entertaining when people don't know it's him.
Why would Ben feel the need to disguise himself and deny that it's him? If he was really doing it, why wouldn't he post it on his twitter, telling his fans to check out the funny thing he did on chat roulette.
But more importantly, I think it's very possible, in the 6 billion people that there are in the world, for there to be another person that looks a little bit like Ben Folds, and is also talented at piano improv. It's not that rare. However, I don't agree that his voice is at all similar to Ben Folds. Especially when he's just talking, like when he says "oh, come on!" His accent is totally different.