From what I've seen most powerlifters have pretty flat chests 
He incorporates both, like Mike Francois, who had that thick blocky look, and who ironically had some fucking huge legs. Ronnie as well. I had posted JOJ's chest routine, and vids of bow he trained chest, which diff than what most bbers do, ironically Branch has bigger numbers than he does.
But, for the most part you are correct...I'm not into powerlifting, but I always thought that the technique and and training and the shirts and shit, were the reasons for flat chests...but when you hybridized bbing and PL together, you get good results in terms of muscular development.