I am not a lawyer, but...... Victoria has no power over aircraft or pilots exercising their craft. They can close victorian registered businesses They can’t close federally owned airport land. . The Victorian Air Navigation Act 1958 ceded all powers to the Commonwealth. I was told all this at Ansett during discussions about our various state based subsidiaries. NSW, SA and WA retained powers over aviation in their states. Victoria gave it away.
.......Having said that, I wouldn’t want to argue with an irate policeman.