i used to work in the supplement industry for many year. i know a decent amount about body building and stuff.. with that said, he could be natural.. at his age, it is harder to say lean than a 20 something year old. height also plays a role in body physique as well. if he is like 5"8, then it is easier to have that thick look than if you 6"0 or something.
he may be on something, test, etc.. but it is definitely possible to do it natural and be his size.
did he have shoulder surgery or something.. look at his left shoulder (right from our view) it seems to square off or something...