They are going to fight China that is 53 times bigger than them and owns half of their country.
Moreover, agents of foreign powers are in crucial positions, all up and down Australian institutions. We don't know who they are, until a crisis strikes. I think there would be more than one supposes.
But let's look at history - every nation has certain characteristics, and they don't just change.
China has never been able to project it's powers outside it's boarders.
When have they successfully been able invade another country? They couldn't even successfully invade puny Vietnam, after Vietnam had been at war for over ten years.
China has been invaded many times, but they've never been able to invade anywhere else.
Mongolia was a backwater's backwater, and they had one of the largest empire's in history. China had a glorious civilization, and they were lucky when they stopped outsiders from taking over.
What was their most successful military expedition? Korea vs. the U.S.?
While it is possible China could say, occupy Australia, I have my doubts as to whether they could pull it off. It would be unprecedented in their history. And they have plenty of their own demographic and cultural disasters coming.