Doesn't matter where the decision came from. The act states that you are responsible for breaches of the act.
It's all very well to say the Duty Manager, CEO or whoever made the decision, but you're presuming the company will still be willing to back you when the dust settles.
Also, what happens if you depart and have some kind of inflight emergency, say a fire. Return to SYD, reduced ARFF and other services during the curfew, evacuation with injuries etc etc. All because you were doing something you shouldn't have been doing in the first place. I reckon the trial would take about 10 minutes.