China is playing hard core domination games with Australia, although they haven't actually threatened to nuke them yet like they did Japan (so far as I know).
It's fair game for Aussie newspapers to call for someone else to overthrow Xi! All's fair and all that.
Actually, China *did* threaten to nuke Australia, and that was a big part of the reason Australia is moving forward with obtaining nuclear powered attack submarines. And given time, I strongly suspect Australia will develop boomer/ballistic missile subs to launch nukes at China, should the CCP make good on their public threats.
As one American senior diplomat said, "China is in some ways its own worst enemy, with their autistic treatment of other nations!"