Not specifically about ATSI people, but of any race. The 'races power' part of the Constitution (section 51(xxvi)) reads as follows:

Current text:
The Parliament shall, subject to this Constitution, have power to make laws for the peace, order, and good government of the Commonwealth with respect to:
"the people of any race for whom it is deemed necessary to make special laws"

Original text:
The Parliament shall, subject to this Constitution, have power to make laws for the peace, order, and good government of the Commonwealth with respect to:
"the people of any race, other than the aboriginal race in any State, for whom it is deemed necessary to make special laws"

https://www.ausconstitution.org/home/chapter-1-the-parliament/part-v-powers-of-the-parliament/section-51/26-race-power

I was not talking about legality.