Why would the facilities be "redundant" in 6 - 12 months, Cirressna? The Biosecurity Act is there for a reason, and the potential biosecurity risks and their (disastrous) consequences are easily foreseeable. Which is why there is a Biosecurity Act.
The costs of establishing and maintaining proper quarantine facilities in 'standby mode' prior to this pandemic would have been chump change compared to the costs - and I mean real costs - of the lockdowns and interstate border closures.