6 plates on incline for 4 good reps (deep, with just a little spot)
Everything aside, that is impressive. Dude was strong
But we didn't see him do anything with six 45s on either side -- not in that video. Greg puts more weight on the machine, then you get a close-up on him and the bar while he's lifting. We never actually see a wide shot that shows him pressing twelve 45s.
If you watch carefully, you can see that his heavy set's simply recycled footage from his previous "set," which was also bogus (a few of those reps were clearly looped video as well).
I feel bad for him because his body is, frankly, hideous ... one would at least hope he was as strong as those
comics magazines claimed. But his video doesn't prove anything except he and his video crew have a very, very low opinion of prospective viewers' intelligence.