He asks: “Were sand/dirt deserts used to cover over older civilizations such as Gobekli Tepe also?” What can Creator tell us?

This is quite true and is in keeping with what we have told you about the sanitizing of extraterrestrial facilities. They are viewed as an expediency in order to support a cover story. They want to blend in to be humanlike enough to gain your cooperation as a deception. As such, they will often do what they need to, in rewriting history, to divert attention from their prior misdeeds by what appears to the casual observer something new taking place so the dots will not be connected and the deceptions can start over from a new time and location.