Please add confirmation and additional confidence to this identification, cf. P. strigosa, by noting the average width of the leaves (either an estimate or a measure, either way) ? Ref': key step 4 : https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Persicaria#4
The inflorescences were enough for confirmation of this identification, for me, cf. P. strigosa .
Of course this, simpler older, ref' (in brief, without full citation): (Rather than taxonomic journal articles.)
• Flora of NSW online PlantNet:
Genus page and key to NSW spp.: → https://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=gn&name=Persicaria