There was an 11 year study that concluded aboriginals may have been living in Australia up to 120,000 years. She just quoted the maximum end of that spectrum.
https://www.theguardian.com/australia-news/postcolonial-blog/2019/mar/11/a-big-jump-people-might-have-lived-in-australia-twice-as-long-as-we-thought#comments
