It's a textbook case of the post hoc, ergo propter hoc fallacy. You assume that he is somehow genetically superior because he excels without any evidence to support this supposed genetic superiority and when challenged on the fact (all available evidence suggests that he is NOT that genetically superior) you claim that he has some nebulous genetic advantage only you don't know what it is. But there must exist because he wins (all the bloody time).No, I do not see the problem. Why do you assume that, in theory, we are able to pinpoint why and how someone is superior in a particular endeavor? Can you tell me how exactly Newton got to be Newton? I make no such assumption and even if, in theory, we would be able to accurately pinpoint a particular set of characteristics one might have to make him superior, we are certainly not at that stage of scientific development at the moment.
Edit: Every time this argument was made it turned out that the athlete in question was just better at cheating than anybody else.