I have noticed these signs over some check in desks too. Given that the programme still states that PS members can use Business Calss/Qantas Club check in desks , I would doubt that there'd be a problem
Equally wrong I have seen is signs at LHR referring to check in in the 1st check in zone for QF Golds ( rather than platinum ... welll it's only been a year or 2 since things changed )
Dave