I'm not going to lurk in here defending the guy on every response but exaggeration and stylization =/= inaccuracy. It's a fundamental skill of illustration that you learn the ins and outs of something and then break it to achieve your desired effect. In this case, its muscle growth beyond human capability. 'incorrect anatomy' would be something like leading the forearm muscles into the wrong insertion on the wrist, or filling spaces where other muscles reside with the wrong muscle. I see muscle artists ignore the brachialis in favor of a super huge bicep all the time. If anything, an unrealistically peaking bicep shows a recognition of the limit of the lower boundary of the muscle, the only way to go is up.
I've studied human anatomy for 5-6 years now and I just can't shake the feeling that a lot of people here don't actually know anything about what they so boldly claim is 'inaccurate'.
Anyways, I'm not getting sucked into a shitty back-and-forth argument over dumb shit like this. I've said my piece, agree or disagree if you like.