I've trained w/Alex before, I can attest to his strength. Especially in the Shoulders and Chest, he's a strong son of a bitch!
And 275 even with suspect form is a feat that not many can say they've acheieved.
And lastly, once the weight goes up the form will suffer a bit, so I can tell u that before that last set of 6, he was reppin out 185 and 225 for full clean reps.