What do you mean "what he does"? He just "does it." At least that's what it looks like to me! What do you want us to tell you how he
coordinates his muscles, what happens within his vocal tract, how much air pressure he's using, whether he tightens his butt or not?
He's just doing it. That's all. I'm sure it took him a while to learn to do it well and the same will probably go for you. The body needs to be
taught how to do this.