You can see some muscles still when he flexes so he must have them underneath.  You CAN get stupid strong really fast if you overeat.  I can tell you from experience that it's incredibly addictive to increase the weight on everything almost every time you step into the gym.  This is why it's important to set a hard limit, mine is when my pants start getting tight.    Not trying to defend him, just making sure he's hated for the right reasons :).