No one has ever proved this film to be a fake. There were no deathbed confessions and the recent reports that a famous Hollywood make-up pro had created and worn a monkey suit were revealed to be false.
If it was some guy in a suit, Bob should have shot the idiot and settled it one way or another.
The film stands as a litmus test. If you would like to believe there are apes in North America, it is compelling evidence. If you tend to reject such notions, you see a guy in a gorilla suit.
Personally I like the idea that we have not quite figured everything out yet. Unfortunately, the true skeptics will never believe it until some hunter does indeed shoot one and we have it on a slab.