Although I tend to agree with you, as I believe the ancient technologically-advanced civilization is much more likely to be human (more specifically, Cro-Magnon), ...
If you believe ancient peoples were tecnologically advanced, why do you think that there is no evidence for
the tools and equipment?
I haven't seen any good reasons to dismiss the possibility of aliens, have you? And if so, please share.
It's the total lack of evidence and reasons aliens for , and the multitude of reasons against, that convince me!