It probably mentioned the 60 million or so Bangladeshis that will be looking for dry land to live on.
When this really kicks off there will likely be war between India and China over water in the Himalayas if not Taiwan to distract the Chinese general population.
They have already lost a lot of their crops this year due to flooding
Massive movements of millions of people seeking habitable land. ( Do you know anywhere near Asia with lots of empty space?)
Agricultural collapse, water wars and disruption worldwide…
It will make the boat people nonsense of the past 2 decades look like a nice walk in the park.
There will be a lot of climate disruption in Australia no doubt, (already happening with fires and floods and rising seawater temperatures) but at least a lot of land won’t be under water or destroyed by high salinity like the Ganges-Brahmaputra-Meghna Delta.
The biggest natural defence Australia has is its hostile deserts to the north west and centre but when 1 or 2 or 30 million people decide they have to move to survive that won’t stop them.