Regardless of whether you support/believe the Out of Africa theory or the multiregional theory Aboriginals, Denisovans, Neanderthals, Papuans and all other known races originated from Africa eons ago. As nomads they wondered, travelled, migrated, squattered, and invaded other continents, regions, lands and peoples. It's true that aborigines are the oldest known civilisation on earth but at 65,000 yrs that is relatively embryotic when compared to the age of earth (at 4.6 billion years) or the age of the skeletal remains of Ardi at 4.4 million yrs or Lucy at 3.2 million yrs.
So whether you believe in creation (ie some higher power created all this shit) or evolution (everything emanated and evolved from some random cosmic big bang) at the end of the day the planet belongs to nobody and we are simply nomadic squatters. We come into this world alone, naked, and with fuck all, and we leave it the same fucken way. Nothing we say, do or argue about, can change that....it is what it is!
People, nations, cultures, languages, powers, religions, etc will come and go but earth will continue to remain terra firma (ie unless some fucked up group of deranged individuals decide to randomly press the red button - and we're not far from that scenario)
So arguing about land rights, illegal occupation of lands and territories, invasion, colonisation, imperialism, national anthems, flags, coat of arms, emblems etc is frivolous. In 65,000 years from now no one will give a fuck about Albo, Dutton or the result of the referendum. So enjoy life and keep punting while you still can.