> how they handled species with no density figures
Many species were excluded from estimates because there
is insufficient information on their abundance. The largest omission is the entire NSW bat fauna (37 species), for which no information on density could be found. (page 16)
>This is contradicted by the statement put out by the university of Sydney: https://sydney.edu.au/news-opinion/news/2020/01/03/a-stateme....
I quickly skimmed the source that you've linked, and it says nothing about how they handled species with no density figures.