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.