That is not what starnet does. It just removes the star from the picture you took, nothing else. It also predates generative AI by a few years.

If by "not real", you mean "you removed the stars so it no longer reflect reality!", then real photograph doesn't exist. For example, OP uses narrow-band filters, and it's common to map H-alpha wavelength, which is red, to green in the images. Does that make it unreal?

In the end, astrophotography is more art than science; the goal is more about producing aesthetically-pleasing images than doing photometry. Photographers must take some artistic license.

They're a lot more real than CG/AI. It's very rare and maybe not even possible to have a "true" astrophotography photo. At those light levels, eyes and camera sensors work very differently and even a "plain" astro photo has either been processed a lot, or else doesn't look like what our eyes would see.