As everyone has already demonstrated, IMGs that want to work in Australia have zero chance gaining registration through the traditional internship matching system local students use.
However, this doesn't mean that an IMG will never get registration. What most do is apply for odd jobs in rural areas/areas of need. They work in a department at the level of an intern/JMO, or in a general practice setting if they have suitable overseas GP experience. Eventually when they work in the department long enough, they are able to apply to the AMC/AHPRA for general registration and then 'mix in' with everyone else. These jobs are very difficult to find and are highly contested amongst IMGs, but I imagine an Australian citizen who speaks good English would be preferenced over an non-Australian IMG. The competent authority pathway has made it even harder for non-UK/US/etc. IMGs to find jobs in Australia.
The door is very much closed for any IMG. Its much simpler to study in Australia, even if it means sacrificing extra years for study/GAMSAT.