... Because Game Theory is math?

Math.

That's like saying we'll call exponentiation into question because a population's growth didn't follow an exponential rule. Mathematics is inviolable, therefore if observation doesn't line up with it, we must amend our understanding of our observation (i.e. find new mathematical models to use instead.) E.g. if science says animal populations increase exponentially, and we find a population of animals that has not increased exponentially, we don't throw out mathematics, we throw out the model that says populations increase exponentially!

Game Theory stands forever. Empirical observation, however, is infinitely more flawed than math. It's much more likely we failed to understand how natural selection works, and that our mathematical models were wrong. Calling into question fundamental mathematics when your science doesn't make the cut is absolute dogmatic thinking. "Math disproved my theory... MATH MUST BE WRONG!" Seriously.