People who like to argue they have insider info on who or what the real aliens are… Probably are just trying to play the "I am more enlightened than you" game.
However, history is full of stories of people from the sky/stars. One of my personal favorites is Kaguya-Hime from The Bamboo Cutter. In the story, an old man and woman, who can no longer have children, find a child in a stalk of bamboo. The couple raise the child as their own, and begin finding small chunks of gold within the stalks of bamboo the old man cuts.
As the child grows into a young woman, she becomes a legend of beauty and is sought by many nobles, to include the emperor of Japan. However, Kaguya's people, allegedly from the moon, return to take her back to her people. They place a cloak around her, and she forgets her time among humans.
In pursuit, the emperor led his armies to the top of Mount Fuji, where he discarded the Golden Elixir she bestowed to him. The historical name of Mount Fuji is actually based off of this account.
Japan still has the original artifacts - the imperial regalia - bestowed upon the first emperor of Japan, who was the grandson of the goddess Amaterasu.
You ever notice that human space ships in most sci-fi have Japanese names… Or that most space-based Sci-Fi have their origins in Japanese fiction?
Just saying - it would be rather arrogant to completely dismiss the prospect of aliens… Or, the idea that we kind of are the aliens. There was an interesting game from the 90s; "Battlezone: Rise of the Black Dogs." It covered a war between America and Russia in space through the 80s and 90s, as they rushed to claim relics of two factions of a martian species - one of which were the Cythonians of Greek legend.
Just saying… The wikileaks publishings which deal with secret moon bases and fighting in space with the Russians… Kind of makes that work of fiction look a little more plausible.
People who work on secret projects can't tell you what they do. But… If fictional characters and events bear an interesting resemblance… Well that's just coincidence.
If you believe in such things.