Nah, he never resorted to that (never had to) when all his compadres were doing it (Nasser, Flex, Markus Ruhl, Chris Cormier, Jay Cutler, etc). I highly doubt he will now.
I wouldn't put Cormier on that list, he started going downhill his final year of competing after his tricep tear, prob injected himself with oil to balance out and retired right after
Look at his whole career all the way to around 04/05, his physique never looked "suspect"
He was still winning shows and got screwed countless times at the Arnold, should have beaten both Jay and Dexter, he was better and bigger than Dexter ever was
Does this physique look like he has oil in him??