The Qantas Club in ADL usually makes announcements for all flights, including international flights.
For international flights (depending on the contracted airline), the boarding announcements may be made after regular international economy has commenced boarding.
The airport is small enough so that international premium pax can clear additional international security and border control to walk straight on board after that.
However, if you want to do duty free shopping in the international area or need to pick up duty free items, you will need to leave the Qantas Club earlier.