Just on the leak's in Vic. It turned out that most were not really leaks, but rather the DHHS releasing information earlier than the Vic Presser each day.
I used to wonder how some journos found out early and like you presumed they were leaks. However late in the second wave I discovered that the Vic DHHS updated two data tables on its Covid 19 webpages, which are pages there to inform the public, including journalists.
This was done once per day and normally early in the morning well before the Vic Presser by Dan. Leaks would normally not happen before the table was updated, only after and so were not leaks but rather a public release of information.
One table had the new positive tests, and another would show new cases still under investigation (which could be unknown community spread).
The presser was later sometimes an hour or so, and sometimes many hours later.
By the time of the presser as hours had passed the cases under investigation would often be less as cases would be linked in that time.
The positive test result would also sometimes be less as a case may be reclassified in the interim.
So the daily overall table released was close to the morning data table released, but sometimes a little different, plus would have additional information such as test numbers and deaths. Hospitalisations and other data would also be made available at about the time of the presser.
Later in the day the CHO (or his department) would issue his daily update and this would have a lot more detail such as locations, clusters etc. But also the numbers might changed if more cases were reclassified.
The CHO or DHHS would also sometimes randomly issue a release include at night and especially if there was a high transmission risk.
Now from time to time there were no doubt true leaks, but many were just from accessing the public data tables and especially when they were just referring to raw numbers.