We know almost literally nothing about the Aboriginals before European arrival, so basically even if we made them an actual tribe, they'd be more or less complete OC. If you want an OC so much you may as well just use custom nation builder and you'll have a good chance or being more or less just as historical as the Aboriginals that Paradox could make.
Also it seems to me very strange that your only argument that Aboriginals were somehow this highly organized group is basically a single source by a nationalist author that mainstream historians evidently have given no damns about. If we were just following sensationalist fringe historians then Ming China should have outposts all over the Pacific islands and a foothold on California in 1451, but nobody argues for that more or less because it's complete gibberish that's bought in by no historian that actually matters. Same for the Aboriginals, it seems strange that people consistently argue that these natives were literal magic and had super advanced agriculture techniques that nobody else on the planet figured out despite being isolated from all sources of cultural exchange and having dubious crops and fertility levels in their homeland.
Also it seems to me very strange that your only argument that Aboriginals were somehow this highly organized group is basically a single source by a nationalist author that mainstream historians evidently have given no damns about. If we were just following sensationalist fringe historians then Ming China should have outposts all over the Pacific islands and a foothold on California in 1451, but nobody argues for that more or less because it's complete gibberish that's bought in by no historian that actually matters. Same for the Aboriginals, it seems strange that people consistently argue that these natives were literal magic and had super advanced agriculture techniques that nobody else on the planet figured out despite being isolated from all sources of cultural exchange and having dubious crops and fertility levels in their homeland.