My doubt this is O. sirpus was looking at the MoV visual key (Part 6) which shows O. sirpus antennae in the male are yellow/straw coloured with short rami. Looking at the antennae here in Photoshop they have a different apparently longer rami which seem to be orange coloured. Although the forewing markings suggest O. sirpus we know they the forewing markings are highly variable in Oxycanus (genus). iNaturalist also indicates O. sirpus occurs mainly in southern Victoria. This sighting is from the Southern Highlands NE from Canberra.
ditto many of this group incl. O. australis and O. dirempta. I was looking at examples on BOLD, iNat (Research grade) and Moths of Victoria and trying for the best match I could find for the colour, markings and antennae. Location may be too far north for this sp. I had thought it was close enough.
time to now ID the remaining ~ 20 unverified Oxycanus moths on the system as Oxycanus sp. go to https://naturemapr.org/categories/sightings/256?filter=unverified