I don't think this is Senecio diaschides. The leaves aren't right, see:- https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Senecio~diaschides
But it also doesn't look like Senecio bathurstianus. It is an unlikely location for S. bathurstianus too, near the Hockey Park. It might not be a Senecio at all. I would like to see a flowerhead.