I personally think the chances of the major winning are low and the odds were against him. However, people do win against all odds. Take for example, tossing a coin 10 times in a row and getting the coin to land on heads each time is unlikely to happen, but if you toss a coin many times, eventually you will eventually end up tossing heads 10 times in a row. Put enough people in the chair, and eventually someone will win the jackpot regardless if they know the answers or not.
However, I felt the evidence against him were weak and the people putting the tape together are program makers and it was edited in the prosecution favour. I feel the coughing was not the way that they did it, too many people in the audience were coughing and not all at the right moment. However this doesn't meant that they used other methods to cheat or he could just have been extremely lucky.
If you are asking is he guilty of cheating by coughing, I would say no.
If you are asking is he is guilty of cheating by any other way, I would say highly likely.
But a small part of me say that he might have just got lucky, but very unlikely but possible.
I think that there are things people can do to increase their chances of winning, but is it cheating if you have a game plan? After all, most people that play games, will have some sort of game plan.