You sure? Because I don't know too many people that can fake a #3 or #4 CoC gripper for a timed hold like that (couldn't read the stamp, I'm assuming a #3). Most people would battle to close one let alone hold it closed. So I'd then assume no need to fake the bench or curls.
I can back up what zendorian says, I am one of the guys running that gym. They brought four 15 kilo plates and sprayed them red on the lawn outside the gym to make them look like 25 kilos. I mean think about it, there is no doubt Magnus' strenght is hellish, but why risk something that could injure you and keep you from competing that season? He has also torn both his biceps and I doubt he wanted to be on hiatus once again. I have personally seen him bench press 250 kilos for 5-6 reps x2 and 270 for 3 reps, so yeah he is strong.