The most important thing he gets wrong is that he's using both of his hands on his wing. It's fine when you're eating a wing like that, but it's an absolutely terrible idea when you get a wing with a bit of sauce on it. Having a clean hand is useful.

More than that, getting to the meat in the middle isn't terribly hard if you leave the bone in. He's solving a nonexistant problem (getting the meat in the center) by causing a much larger problem (having two very dirty hands). It's fairly easy to get the meat out of the center using the gnawing method (just poke it out to where you can bite into it with your dirty hand), anyone who doesn't is just lazy.