Wide angle lens could explain it. We see the earth is not fully illuminated in one of the pictures. And the “curve” of the lunar surface is most likely from wide angle lens.
You’re stuck on being certain we’re looking at the dark side. My point of wide angle lens is maybe we’re not looking at it in a crescent state after all, the angles just appear that way due to the lens. You can see the illumination state in the other photos.
I’m not sure what you’re proposing, that this is a fake image?
I'm not "stuck" on it being the dark side. Of course I'm certain it is, that's how the solar system works. It's how shade works. The sun isn't in between the earth and the moon, or else we wouldn't be here commenting on HN. ;)
