Hmm, so going by what you said, it really does seem a tad bit unfavourable towards international students who did previous tertiary study in an overseas university because either way, they will almost certainly not qualify for med/dent via ANY route at all whatsoever
It's unfavourable towards Australian students (who are not considered "international") who did previous tertiary study in Australia. It's highly unfavourable for international students in general (except the government-sponsored ones). Let me quote this from the information about the MBChB degree at Otago:
Normally, no places are available for independent international students in the Bachelor of Medicine and Bachelor of Surgery (MB ChB) programme, however a very limited number of places may be available in any year if a reduced number of sponsored students (under the terms of contracts with overseas governments) are enrolled.