The gist of this question is NOT to determine whether or not Coach is a liar. Of course he is. What I'd like to gauge is how many people think he's sincerely and actually the delusional idiot we see presented on the show.
Yes, he's definitely a real person, who had a real life outside this show, that's been somewhat documented by now. He's not "an actor". But is he, in fact, a guy PLAYING dumb--VERY dumb--to get famous? Or is his apparent extreme level of delusion completely legit, wholly sincere?