Hes also lifting shirted. Scot Mendelson Pusshed 715lbs raw (no shirt) and had a 6 pack back then. Jeremy Hoornstra is around 700's and also has a 6 pack.
As for all powerlifters not having good bodies... Check out matt kroczaleski, jim wendler (recent, since weight loss) and ofc mariusz pudzianowski. They got 6packs and never use cutting drugs.