Qantas and priority baggage are not synonymous. It depends on the moon, tides and weather as to what happens at the carousel on arrival.
This is one of two worst(> or = to boarding ) aspects about traveling with Qantas as a priority pax from as as far back as I can recall.....'priority joke' is more an apt descriptor. Qantas is still at kindergarten level here compared with the likes of JAL, CX etc.