WOW. That's quite an accusation.
My family and I need more closeups of the "North Korean" fans, though, before we can weigh in. Yes, we can usually tell where someone's from in Asia just by looking. (You mean you can't?)
As for the idea of faking fans, well, I'm not surprised. Fakery for the cameras is the point. Don't you remember half the shenanigans at the Beijing Games?