Should there be no amendments to the easing of various restrictions announced this week, come November, an international returned traveler can arrive in Sydney, transit to Melbourne and walk around with complete freedom.
Nope. You still need a permit to transit to Melbourne, and I doubt you’ll get one as a recently arrived returnee from OS.
But as Keg points out, VIC seems to be following the “open up” strategy, but they are a few weeks behind NSW in vaccinations. I would expect VIC to go iso-free inbound before too long. At the rate things are going, it is only taking about 2 weeks to get from 70% to 80%. (And then only another couple of weeks to 90% - I must say that I’m impressed by that. It’s quite possible that both Sydney and Melbourne will be close to 95% vaxxed by Christmas, with maybe some regional parts of each state a bit lower. Aussie Aussie!).