Great topic u bring up here! I agree with you 100% There have been many civilization here on earth that have been nearly wiped out, just to restart and have no memory of what came before. the examples u bring up here and many many more that are out there, should at least open peoples eyes to this possibility and not to blindly believe what mainstream archaeology would say.

Dinosaur depicted in ancient Cambodian temple

Simon Parkes and a few other researchers have said we are the 7th version of humanity that have played this "game" on earth. 6 previous times humanity failed, I think this will be the one that breaks through. Interesting to note, the Matrix movies allude to this theory/idea as well.