WRT to the article Australia seems to be paradoxically "big" and small at the same time (it's the biggest country after Brazil), with the big desert areas making its habitable area much smaller than one could suppose (Japan has a similar problem, even though it's bigger than Germany)
There are official migration statistics, so you can look that up and check for yourself - here is a good start:
https://www.destatis.de/EN/FactsFigures/SocietyState/Populat...
Edit: an example: https://en.wikipedia.org/wiki/Grand_Canal_(China)
Quote: "The water of the Snowy River and some of its tributaries, much of which formerly flowed southeast onto the river flats of East Gippsland, and into Bass Strait of the Tasman sea, is captured at high elevations and diverted inland ".
Sorry, what? Australia is 6th largest, after Russia, Canada, China, the US, and Brazil.
Not that I am keen on ridiculous population growth, but just interesting to think about.