I understand that he have a negative score but unfortunately since I'm not so familiar with the board i misunderstood the feedback score.
Why are such scammers not getting banned, despite multiple scam reports and proofs?
I'm sorry to blow your bubble cause the forum policy is not to moderate scammer but doesnr mean it support it which the reason why people especially the DT tagged every users found in the act. However, you said you understand he had negative feedback which mean the problem is from you ending by not doing proper research about the strange youre dealing with.