No, because the NSW legislation (that you as a pax are unaware of) states you will wear one while in their airspace too.
It would have made more sense if they had just said you must wear one while in flight between two Queensland airports. It makes absolutely no sense to imply you have to wear one to the border then you can take it off. Does the crew now have to announce "We are crossing the border, put your masks on/take your masks off" now?