He has not been on the site for a few years but called himself plantman.
I bought a plant from him through Trademe (Ludwigia inclinata var. verticillata "Cuba'). I didn't suspect it had been imported illegally and subsequently had a visit from Maf biosecurity. I assumed he was a reputable dealer.
Luckily the plant had died and Maf were happy but it could have just as easily gone the other way with all my plants and fish destroyed.
I assume others bought plants as well and received a visit, and they may well have not been so lucky.