The Japanese poster actually makes his own argument. If you didn't translate it all, he basically goes on to explain that in the earlier scenes, she appears shaved, and as the game progresses, her pubic hair becomes more noticable, to the point its very thick by the time you rescue her from Veloce (animation 717.) In other words, she normally shaves but is denied the chance while captured. His real catch point is an inconsistency in one of the scenes, where in one animation she's got hair and in the next she doesn't, then does again - explained either by a lazy artist or an animation translated from one part of the game to another late in production.
So artists should generally draw her as shaved in situations where she'd have access to do so, and not shaved if she's been in capitivity awhile.