As to credibility, he's found exploits before, and used them before. However, he also likes to come on the forum and pad his ego.
he talked about this specific exploit in july and no one cared. we will see how this works out. maybe he is right but I do not see his motivation in what he is doing
No, he talked about a difficulty adjustment exploit. This one's new.
I'll be looking through his posts to find what we're both talking about, and update it here. Unless you get to it first.