The lady from my Association rang me back. She got the old ad for the Professional's Platinum Edge card back up, and told me that point 3 of the terms and conditions detailed the complimentary flight, and that within it was a link to the Amex conditions, which in turn said I had to be a member of the Ascent program in order to get the complimentary Virgin flight.
So Virgin it is. Virgin would thus have to be pretty bad for me to switch back to Qantas Direct, because I'd miss out on the annual free flight, and because the number of Velocity points seem to take me around 10% further than the same number of Qantas Frequent Flyer points. Looks like I've been forced into a good deal.
Luckily, I've still got 100,000 Qantas points if I want to go somewhere domestically, where Virgin doesn't fly to.
Regards,
Renato