If I may offer any consolation, since he's no longer on DT, be it DT1 or DT2, his feedback will not appear on your profile or anyone looking at your profile, unless for those who put him on their trust list. As you can see on the screenshots below, for the public and most members' eyes, his feedback is "hidden" by the "untrusted feedback" button and your trust score only reflect those on current DT system.