Yes, and that's only what they've found out so far. It's always a matter of how deep you dig. I have no doubt that the estimated time of human arrival in Australia will be revised as even older finds are made. Unfortunately, for that to happen you need this sort of site. :(
I don't know much about Aboriginal heritage, but I'm trying to read more prompted by these stories:
https://www.theguardian.com/australia-news/2020/aug/28/more-than-100-aboriginal-sacred-sites-some-dating-before-the-ice-age-could-be-destroyed-by-mining-companies