I'm slightly confused about the relationship between chess.com and these tournaments. If he gets caught cheating at a FIDE tournament, they could do whatever they want -- ban him for life, whatever, it is up to them. If he gets caught cheating on an online game, whether it is chess.com or counterstrike, who cares? It is an unranked online game (or the ranking is tied to some account gamerscore thing).

Unless their chess.com scores feed into their FIDE ELO scores or something?