How do you know that humans have been into space just because satellites exist? First, satellites could be brought or held up by balloons rather than rockets. However, even if they do get up there and orbit in the way we're told, that doesn't mean that humans can do the same. Robots/computers can survive many conditions that humans can't, including radiation, lack of atmosphere, etc.

I saw those starlink satellites one night, just outside with the kids at a small campfire. Thought it was a shooting star when I was pointing out the few constellations that I know. Then another, and another and another. Clearly not aircraft, and clearly not meteorites. Freaked me out a bit. Went inside, and after some searching learned about them.