Haven't watched it, but why would women be harder to animate than multi legged creatures which would have more to consider?
It's about doing more work. You can copy and paste the same male model for all human-like enemies / characters in most games, which is sufficient enough (at least from a gameplay perspective). You have to create a female body on top of that, which means extra animation work. I think that is what they meant by that statement. It's mostly lazy bullshit tho.
However, the mere depiction of beating / killing and shooting women is to this day is still not accepted by a vast group of people and is still carefully handled even in media. So I can understand, why some devs rather choose not to bother with that, in particular in earlier times.
That's why we still have "catfights" in god damn EVERY MOVIE in existence. I actually cheered when the female antagonist in Guardians of the Galaxy popped up for the final confrontation and just got a rocketlauncher to the face, just because of how refreshing it was to not have a catfight between the female of the hero group and the female of the antagonist group... or so I thought. Of course she had to reemerge later and guess who fought her 1-on-1... urgh.
Seriously, this is by far my most hated trope. I'm SO sick of seeing it. It's so god damn predictable.