Hi Serfty,As per this: Lounge Locations | United Arab Emirates | Dubai International Airport | Associated Lounge | International Business Lounge
You must be in a QF flight number.
The agents at the entrance to the EK lounge should be very familiar with this access.
I did read the Qantas page you linked. However when checking on Emirates site, QC access is not mentioned. I'll accept your advise.