You see, until very recently, the Government classified all those cities as "regional". It only removed Perth from its "Regional Australia" list in November last year. The others continue to be eligible.
You pretty much have to live in Sydney, Melbourne or Brisbane, plus Perth (since November) and (rather bizarrely) in Australia's Theme Park Capital Gold Coast, to be classified as "non regional".
Strange, but true!
What's your definition of Regional Australia? Tell us at facebook.com/sbsGerman
Further Reading

Changes to Australian working visa - What you need to know