You can never tell what people use by looking at them. Sorry.
First, Genetics play the biggest role. Some guys are just big, lean and lucky to be that way. I know guys who have never lifted a weight, yet have very impressive physiques.
Second, if you have millions and millions of dollars on the line would you not juice all year long??? I mean, bodybuilders juice all year long and the top bodybuilders probably don't break the 1mil a year mark.
In any case, his training/diet, gear and genetics allow him to look like that all year long. He defeinitely keeps his physique looking in peak condition.