It looks like Business Rewards (basically Saver Business Class award seats) are not being offered to Velocity members either. (milevalue.com)
At the time of this article, April 2017 had one of the best months for availability and for Saver business class seats and you can see how limited it was to Sydney in April / May in the image below. (uponarriving.com)
While it's a pretty normal 737 - 800 with domestic first class seats that flies the route, it's difficult to find saver business class space. (travelcodex.com)