An update:

Called QF Premium, got my usual dose of exceedingly poor customer service (agent talked over me when I asked about the status of 66 D/E/F/G, told me I had to call the exit row purchase number 1300 799 798, haven't had training, not interested in finding out, goodbye..)

Okay, I'll quit ranting now

So I called the exit row number, was advised that 66 D/E/F/G were not for sale but are blocked - unfortunately not able to put in a seating request, recommended that I ask at the airport.