FIFA corrupt as fuck? I think that's already been proven. Var corrupt? Quite possibly, but not necessarily driven by FIFA. You only need to look at cricket with the spot/match fixers which is pretty rife. Quite easy to influence a var official tucked away in some studio, someone of them earning peanuts whilst players earn millions. How they came to the conclusion that head butt was a yellow is somewhat perplexing. The only logical conclusion is outside influence.
I know he didn't make that decision but in general the referee was absolutely pathetic, zero authority and just allowed himself to be intimidated and disrespected by Colombian players. An absolute embarrassment to his profession.