Even if it is possible that Aboriginal people retain stories from long ago (unlikely in my opinion), this doesn’t prove that Aboriginal culture is unchanged for

Even if it is possible that Aboriginal people retain stories from long ago (unlikely in my opinion), this doesn’t prove that Aboriginal culture is unchanged for 40,000 years. I am highly sceptical of all these stories of Aboriginal people retaining non-useful knowledge for thousands of years. It doesn’t happen anywhere else in the world. A really good counter example is the Tasmanian Aborigines forgetting how to fish. They fished (the waters of Tasmania are teeming with fish) until 4000 years ago and then for some reason stopped. If you lose highly useful information like how to fish, how likely is it that you will retain stories from 10,000 years ago of some comet?