A google search says he weighs 202 lbs. One-rep max calculators estimate somewhere from 428-440 lbs from 405x3. An extra 35 lbs on your 3-rep max seems like too much so let's say 425-430, but even then that's a borderline world-class lift if he really weighs only 200 lbs.
In this video though he looks a lot bigger than 200 to me.