The functionality of their website is so poor that all you can really do on it is buy a flight. You have to call them to do anything else. If they make so much as a 5 minute schedule change it locks you out of the booking and you have to call them. We already know that it is a full time job in it...

It is likely that something has gone wrong. You are going to have waste several more hours of your life listening to Qantas hold music to get this sorted out.

I think the government funded tests will be fine. I think that's what most people will do.

My prediction is that some form of quarantine will be required in Sydney. I think its unlikely that they would allow local passengers and passengers transferring from international flights to fly together on the same domestic flight to Melbourne. Edit: Looks like my prediction was wrong. Hopeful...

Having watched our leaders for the past two years telling us that covid related decisions are made on a day to day basis using the latest health advice, I don't expect quarantine arrangments to be any different. If international travel does return on 1st Nov then we probably won't get the details...