lol wat
if you ever been to a gym you'd know that is definitely not 6 x 45. There is no one in the world that is strong enough to lift a barbell with 6 plates on it with one arm.
Those are bumper plates. Bumper plates have the same diameter whether they are actually 10 pounds or 45 pounds. We can't tell unless you could see it. Usually they are color coded.
Considering his size and the weird set of movements he's doing (and balancing it all on one arm), I'd have to guess its somewhere under 100 pounds but over 70.