Trust isn't moderated. I'm not sure what you think this would accomplish?
I just want them to verify that the trade really did happen. I don't want anyone to think that I'm another person.
He isn't in DT and thus your rating isn't affected, it is still 0: -0 / +0.
so was mexxer and lutpin just a while ago. now look at them. better safe than sorry.
Just ignore this feedback (like the other multiple negative feedbacks you have received from people not on DT).
In case he moves to DT (say like mexxer and lutpin), you can argue for his removal from DT (and not for removal of the feedback he has given you, cos trust is not moderated)