>>718221537 (OP)
It's not. The real problem is everyone misunderstands cosmic horror and thinks it means squid men or some shit. Cosmic horror is a form of existential horror, where the horror is realizing that in the grand scheme of the cosmos humans are insignificant and reality doesn't give a shit about what we consider to be moral, good or evil, or how hard humanity strives to triumph.
The movie Alien (1979) is cosmic horror. It is about an alien species that may or may not be a form of bioweapon that reproduces through parasitism and doesn't particularly care about humanity beyond being good for more reproduction. Add on the fact that the xenomorph is likely just one of the horrors out in the cosmos humanity will have to deal with now that colonization among the stars is possible just adds to it.
But everyone thinks to be Cosmic Horror you have to have some living moon that devours consciousness while making people mutate into pools of goo, and none of those actions serve any purpose, because the moon doesn't actually need to devour consciousness while turning people into goo, is "Cosmic Horror" and it just does it because, "Oooh, big scary space thing!"