Reported these plants last year, (https://canberra.naturemapr.org/Community/Sightings/Details/3869165) but they were IDed as A. cultriformis. I have stuck with my original ID of A. pravissima, as the leaves look different and also they are large (4-5 metre high) trees. They do not look at all similar to a planted specimen of A. cultriformis nearby. I hope the new pics help to shed better light on these plants.
There is no sign of the second incomplete main (longitudinal) vein in the leaves, typical of pravissima. According to the floras, cultriformis can grow to 4 m high. Here are the diagnostics of pravissima. http://worldwidewattle.com/imagegallery/image.php?p=0&l=p&id=23788&o=1