I believe him, he is in great shape in all of the other pictures of him after bodybuilding. Many actors do such things, take Robert Dinero in Raging Bull for instance. Not the biggest Kevin fan (flamed him to the point he melted and deleted his account), but there is life after bodybuilding and he seems to be making the most out of it. For all those who condem him for letting himself slide.... he has still accomplished more in BB than all of you could collectively hope to consider.
I personally feel that the guys who stay on after BB have no other avenues to turn to except perhaps pushing suppliments in which the need to be in shape to keep the image. What's next for Ronnie in retirement, he'll backslide as well. He can't speak well and is not very marketable on his own.... Just food for thought.