gnostic
The Lost One
the continents may have changed.
Except the ancestors of today's Australian indigenous have inhabited Australia for about 60,000 years.
They didn't leave and then come back. And, they didn't just died out (eg Genesis Flood) and new population of aborigines migrated here.
Every little of indigenous cultures have changed much in the last 10,000 years.
Continents don't move as fast as you believe, YoursTrue.
Beside that you are completely ignoring the fact that the tectonic plate of Australia (Indo-Australia plate) is closer to Asia today, then it was 4500 years ago. Per year, the plate has been moving between 6 and 7 cm. So 4500 years ago, Australia would have been 0.27 or 0.32 km further south.
Even at faster rate (7 cm per year), for Australia to even move 1 km, it would have taken over 14,200 years.
The point is that Australia is moving north towards Asia, not south away from Asia.
Again, you not thinking logically.