I highly doubt that, you honestly believe she's telling him to do a subpar job on purpose if he could do better? That doesn't make a lot of sense to me personally. Even at the angles they use, the dude could certainly afford to try harder, I think he's just used to putting in as little effort as possible and it shows.
I dunno, maybe it's just me, but I feel that any self respecting man making porn with his partner, would actively want to show everyone how good he is at railing his girlfriend as a matter of pride. Hell, no one's perfect, I could easily forgive someone doing a terrible job now and again, but with this dude it's every video he's in. The guy is definitely incapable. I have a real hard time imagining a situation where he's like "Yo lemme fuck you properly this time!" and she's all "Naw dawg, just lay there like a drooling starfish, that's what the fans want!" lmao.