If Yianni's whole appeal rests on the idea that the two phantom points he was mistakenly awarded could not be challenged because five seconds had elapsed, that's pretty thin as injustices go, because then we're merely trading Yianni's procedural injustice for Zain's substantive injustice.
The idea that USA Wrestling is going to flip the match on a post-match appeal, besides ignoring the fact that such a thing has never happened (so far as I'm aware), requires deliberately ignoring many other rules in tension with the rule relied upon for the appeal, but more importantly, relies on the dubious idea that USA Wrestling has any interest in getting into the business of reviewing matches days after they've occurred because it implies far more that than the instant matter. It's a pandora's box.