I do not believe he is cheating in any form or fashion. His yearly leaderboard bets with various people add up to about $1500 worth of betpoints? Is it really worth a year's time and effort for a mere $1500? It seems to me that his time(anyone's time) is more valuable than that and he would be better served doing something else rather than wasting a year of his life. I believe that he is truthful in saying that he plays here for fun and entertainment. I highly doubt he has orchestrated some big scheme and had players sign up just to dump chips to him.
Calling someone a cheater is a serious allegation...the burden of proof is on the accusers.