No, she doesn't really become flat side when in motion. Her upper torso remains the same while her hips change with each step which is very plausible but not quite a normal walking posture IRL but it still is a tweaked image to resemble movement. Which to be clear, is an appreciated change w the new designNo, in motion she is very clearly at a flat side on view and her boobs are still sticking out awkwardly because she isn't REALLY animmated, it's just a still image that has been tweened alot to make it kinda resemble movement. So you never actually see a change in perspective.
Even if she's standing still like in your pictures it still looks weird because boobs just don't look like that, it's freaky once you notice it.
It comes off as very amateurish and it's one of the things I'm hoping they've changed in the new version.
However, the underlying truth is people don't really pay attention to walking animations for side scroller H games. The real focus belongs to H animations as it's the main content. A great example to this would be another H game called "Goons Raid Her"
Janky walk / run animations but overshadowed by the H scenes it has
"bOoBs DoNt LoOk LiKe ThAt"
Hmm.... Never realized all boobs must be in uniform to each other when it comes to appearance according to you