It doesn't get folded to him all that often when he has a hand to play. When it's limped to him, he's punishing the limpers. He's playing position. When it's limped to him, he raises with a wide range and steals on the flop. He doesn't call with the little suited connectors like 56s and hope to make a hand. He pressures his villains. The value of the button isn't that you can call and fold well, it's that you can take control of the hand, make the villains fold badly and take all the small pots.
I'm betting his pokerEV graphs have a similar shape to carrotsnake's poster here:
http://forumserver.twoplustwo.com/showfl...part=1&vc=1
My position stats are similar, though not quite so wide open on the button. I'm more like 30/25. I do have the same dip on the hijack and hijack - 1. I think I'm playing those seats wrong, but haven't quite figured out why.