In terms of volume, I’m pretty sure a legitimate 11” x 8” cock would be significantly bigger than the very biggest guys doing porn today.
I’m a member of pegym.com too and we recently had some joker claiming stats like that. Oddly enough, he declined to offer any proof. Even more oddly, he claimed to have made several porn films ‘back in the day’ but was very shy about letting on the name he’d performed under. Which is fair enough, I mean porn stars are famously shy and modest, right?