Isn't he already risking his privacy by posting on a public forum bragging about an exploit he abused in the past? I do find the story hard to believe, but we've all seen similar examples of casinos being exploited due to loopholes and bugs in their games, so I'm not going to claim that he's lying because I cannot prove that either. I'm not expecting the OP to provide evidence either, for obvious reasons. For those mentioning why he's not using his real account even though he claims he wasn't active for years, from how I see things, there might be some ties to lead back to him. Even though that's not really the point, what difference does it make if he's ban-evading or not?
Reading the thread, it seems that he has already sacrificed his privacy but he's still under the impression of talking under an alias with his past.
It is all connected while reading the whole story so, there's a possibility that it may be for real. If he's just making a story and just trolling around, he's got a lot of time for it but there's no benefit for him.
It's probably just all about remembering the past and how he's able to exploit it with a lot of money, no gain for him for making this thread.