Eh, we'll see. I think the two are not mutually exclusive. He has an underrated ability to drive to the basket so if this makes him quicker on dribble drives and he attacks the bucket more, so be it.
I think his shot selection is poor because he's stubborn and careless, not because he's afraid to bang. This might make him quicker on help defense too, which is how he is most effective on that end. As ralaw said, he was starting to look a little heavy, especially in his lower body.
Either way, it's nice to see these players reshape their bodies during a lockout, while not getting paid for it. Kind of runs counter to the "NBA PLAYERS ARE LAZY AND DON'T CARE" line of thinking.