During the filming of season 30, it will be Winter in oceania, so a season starting off in oceania is not likely.
Excuse me, haven't heard of other Oceanian countries?
Countries like Fiji, New Caledonia and Vanuatu, are warm all year round. So this theory does quite work.
I'm not trying to be rude, I'm just saying that even if it is freezing in Australia or New Zealand (which it is now, lol), then TAR can go to warmer countries, such as those