dougl, i feel like you're looking too hard to 'not be wrong', you should care less about that, and more about seeing more perspectives than just your own (not trying to rag on you, just my thought).
yes, there is some amount of free money in him making those comments, but you're forgetting that calling him a liar and whatnot baits him to 'sticking to his word' some amount.
fair enough if people feel insulted, dneg's word means a lot to many people (because they respect him), so don't say 'well he's calling 5knl a soft game, that's good for us', because the people who believe him think he's better than he is already.
if he had said, "yeah i could beat ivey on pokerstars at 25/50 i'd bet a million", why would your opinion not be the same as it is now?
this way is actually worse if you think about how many more people he's putting himself above, but better for him because its easier to back out of. making false promises is hardly good, and i dislike being associated with a person like that, i just hope he ends up feeling that the best way out of this is to just put up the money and lose with grace