If anyone thinks for a minute that the individual state's won't lockdown after the target of 70/80% is reached, then you are delusional. Why would they risk voter backlash? Andrews has already said he will if he has to.
They would have to have a damn good reason to lockdown without voter backlash if we did reach targets and not "unlock". I think you would face too much civil disobedience for them to go that route even if they wanted to. Once you promise something you need to deliver or you will get the flick.