Re: How the fsck...
"From being legally sold, yes.
That's what a 'ban' is - a legal decree that some thing is not allowed. It won't 100% prevent people from playing it but it will mean that anyone selling it to Australia will be breaking the law."
Small typo there, let me fix: "anyone selling it *IN* Australia will be breaking the law"
I'm in America. I can sell anything I like within *American* law. Including games to Australia. Aussie law applies in Australia and only in Australia. This is a textbook example of what I call 'Canute Syndrome'; legislating it as if there's a little local internet for local people.
Now if they want to make it illegal to BUY certain games in Australia, criminalize the purchaser... well they can go down that road, but they'll look very very foolish, and rather authoritarian.