On same tree trunk as a golden tailed bullant (https://canberra.naturemapr.org/Community/Sighting/3399947) and initially confused with it. See also https://canberra.naturemapr.org/Community/Sighting/3392295 photographed on the same tree 2 days earlier.
I thought this was another ant at the time. I was inspired to add these sightings after seeing Stuart Harris's recent sightings of a similar spider with a different species of ant.