I see what you did there. Yes there are mixed ancestry people in Australia.
I don’t know much of the history of the aborgines. Did they set up schools such as we did in America, to educate American Indian children? Do aborigines mainly live in the outback working in manual labor of some kind?
40K+ years ago folks walk out of Africa. Some stay in the Middle East as northern eurasia north of the Taurus is under an ice-cap, others walk down across indonesia into australia (water levels are much lower so lots of land bridges)
Some stick around in the Andaman and Nicobar islands becoming Jarawas
others hit the jackpot heading into Australia, a tropical wonderland with lots of big meat-providing animals (mega fauna)
So what if the sea levels rise, cutting you off, you still have easy meat for 10s of thousands of years
Then the climate dries (Australia is the only continent without glaciers)
you then create your myths such as the dreaming about the time before. you split into many many different language groups --there are 4 or 5 language families native to Australia
Then, after thousands of years, other humans come in the 1700s.
They bring crops, horses, cattle (you had NO domesticable animals or plants in Australia before the humans, so there was no way Aborigines could have moved on to Agriculture or animal husbandry)
They treat you as savages, kill you for the land to raise their sheep, then chase you, imprison you, take your children away from you forcibly to "breed out the aborigine" from them
This succeeds among the Aborigines in Tasmania (the most primitive), and partially among the rest on the mainland
Aborigines aren't genetically prepared for the Eurasian diseases so 90% die (as did the native Americans)
They also aren't able to easily metabolize alcohol like Eurasians (except japanese) can do, so fall prey to alcoholism
They are now a marginalized people who still remember their ancient past but their culture was thousands of years behind Eurasian culture when Captain Cook came.