strongly suggests that Australia was first settled by people spreading out, finding an area that suited them, and settling down such that the most recent indigenous DNA in various areas matches (bar evolution) the earliest DNA in those areas (ie no waves of replacement).
Questionable that every people did this, eg:
Aboriginal mitogenomes reveal 50,000 years of regionalism in Australia
https://www.nature.com/articles/nature21416
strongly suggests that Australia was first settled by people spreading out, finding an area that suited them, and settling down such that the most recent indigenous DNA in various areas matches (bar evolution) the earliest DNA in those areas (ie no waves of replacement).