This win might actually be a way to lure people into gambling, it's very possible that the casino allowed it to happen for promotion purposes.
They say that it was genuine and there is no need to debate for that. But one thing is for sure that he's sponsored and that's a huge attraction for that casino.
Sponsored or not, he'll still get to attract a lot of people to whichever project or company he advertises because he's got a wide reach of audience.
And any loss he's made that's big enough, he can eventually recover that with any means of his source of income in the industry.