This is really not the point. The point is not about whether the pre-Aboriginals were advanced or not or nice or not, but why there's a cover-up of their existence.
I am on vacation and borrowing a PC. Look up Cow Marsh, Australia, people. Or maybe Kow. Remains about 12,000 years old, but pre homo sapien. Maybe Aborigenal guilt for killing their predecesors. Goodby till I get home.