I just tried to get into that pose. I'm a fat, short, middle-aged guy, and I was able to do it, with a little bracing against the wall, since I'm not suspended in midair like that character.
That's all beside the point, though.
The fact is that humans - male or female - tend to respond better to people who are considered to be attractive. There is also a tendency in action-oriented art (fantasy, comics, etc.) to show heroic characters with exaggerated, idealized proportions, regardless of their gender. That goes pretty far back, and can even be found in stories without art (like in Ancient Greece). There's nothing wrong with that. I certainly don't feel a wave of insecurity wash over me every time I see a heavily-muscled barbarian character.
D&D is a product, and WotC is going to go with art that helps to sell the product. That particular picture doesn't go full-cheesecake, but it still shows heroic proportions. That seems like a good compromise.
Any ideology becomes problematic when taken to extremes. The extremist fringe factions of the various political parties, religions, social movements, etc. tend to hurt the overall message of the ideology when they start making statements that swing too far into the extreme. The Hawkeye Test and statements about any depiction of a pretty woman as a sexualized image go too far. That's straying into Dworkinite territory.
