And the intitial reason for the QLD / NSW border closure is that NSW allowed people in from VIC so they could lie and travel onto QLD.
And the very same girls could have just as easily flown from Vic to Qld and transited to a flight to NSW. But hey, don't let the truth get into the way of a good story, especially is you are a parochial type.
And with this weeks QLD outbreak in a secure Detention Centre in Brisbane it shows that even putting severe (and even some idiotic and compassionless) restrictions in place, it is highly unlikely that you will stop the transmission...especially on the east coast which doesn't benefit from the longer distances of separation as does the Sovereign Principality of Western Australia.