He's probably pretty strong but I would say it's a slight exaggeration.
I love when bodybuilders lie about their lifting - they always seem to be able to lift "exactly" four or five plates a side - you never get a guy saying "oh my best bench was 471.6lbs".
well that shouldn't surprise you. most gym goers only use the 25s and 45s. ever watched a guy do 135x10, get 185x6 and then pop right up to 225? a guy with a 4 plate bench probably goes 135, 225, 315, 365, then 405. most people try to avoid the little plates for whatever reason (i'm guilty of it myself).
as for his claim, no duh it's bullshit. ryan kennelly hits 585x2-3, nick winters and glen chabot both were in the 3 range with 600, nick got 625x3 once, and brewer's outdoing them all while lifting like a bodybuilder and dieting down regularly? sure.