"rather than push imperialism at them."

Dude, all I am saying is that I have not read any claims by any researchers that there is absolute proof of any sort. You have such a claim, then just show it.

And imperialism has nothing to do with whether the oral history of the aborigines goes back 40 000 or 10 000 or just 1000 years. British imperialism succeded, because they had superior weapons.

The geological record isn't proof enough for you?