the difference is that the bodybuilder aesthetic isn't usually what women are into. Nothing inherently wrong with it of course but it's still built for the male gaze. If you ask a gym buff IRL about it they'll tell you most people who notice their physique are men. The shredded video game dude can instead be thought of as a signifier of masculinity and sometimes as a fantasy for men to project themselves into while playing.
I don't think the washboard abs and boulder shoulders would disappear entirely if male characters were designed more for the female gaze, but we'd probably see some more dad bods and smaller dudes too. Hades comes to mind as an example.