I don't know. That seems kind of excessive to even be pill induced. I think maybe he pumped saline or something into his urethra beforehand. I am a porn veteran, and that kind of made me queasy...Yuck!
I used to frequent pumper forums and they talked about injecting saline solution into the penis and testicals. I think that is what this guy has done, because his scrotum looks kind of full and lumpy. Regardless, it is kind of nasty IMO. My wife would probably vomit if I pumped this much jizz on her...hell, I'd probably vomit, too! I think shooting for distance is much more of a turn on than gross volume of ejaculate!