Jason, thank you for that. I visit Ulladulla and Mollymook often and will definitely look out for orchids in their wildflower reserve. FYI the Ulladulla wildlife reserve supply a photographic guide in their visitors book and Acianthus fornicatus is listed and pictured. So you’re likely spot on. Also cobra greenhood and helmet orchid are included in their guide.
You were a bit unlucky, I photographed these early ones less than a month ago. They are growing in lots of areas at different stages of flowering. This reserve is great to visit for orchids, something is always in flower.