I don't think the issue is "can the film cover it up", for me the issue is: why should HE decide that the editors, and costume designers, and make-up artists and cinematographer have to worker harder (
WHEN PAID LESS) to compensate for his laziness? It's pure ego. Requiring others to worker harder because your giant paycheck and personal trainer didn't 'motivate you enough' in isolation to work for two hours. He has nothing else to do right now, it's not a big ask (esp. when taking into account how much he's being paid to look a certain way).
By the same logic: you don't hire a personal trainer for someone because you don't care what Batman looks like
I don't think it's to do with a power fantasy, if the studio doesn't care to have a Batman in shape, cool. Love it! Embrace the new normal, take a different approach, etc. The fact they paid for a personal trainer, to me, implies that is not the case. For me the issue is about privilege. A black actress is having to train hard because the studio won't tolerate anything less from her (there are so many stories of producers telling actresses they are 'fat' because they aren't a rake). Meanwhile the str8 white guy... brags in an interview about how, when he has nothing to do, he doesn't even train despite being asked to. It just doesn't come from a very informed place. Or a place of understanding about his privilege.