Of course they will. They will argue there is no work for the 380 and thus you can remain stood down. Just because the borders are open, in the eyes of Qantas, changes nothing. If there is no useful work for the 380, and they intend to keep the fleet, then you can remain stood down.
Not saying I agree with it, but it will require the union taking the matter to FWA. You would assume Qantas has already done the homework on this.