He is selling duped gold (Now knowingly since I've posted proof in a scam report). If you buy gold from him and have it removed/get banned for bug abuse, please open a scam report.
It's not duped it's just runique ban very easily, thats why theres very few shops. I sell probemas runique gold and they only buy gold from me as someone has bought it off them, they don't buy bulk off someone in advance.