Most of the feedback is in Russian, and I am not sure what he was leaving as feedback, but he looks like someone who was/is trying to farm for positive feedback and Custom trust list inclusions by meaninglessly sending it randomly to people expecting them to do the same.

Luckily, a number of members must have observed his suspicious behavior in the past and excluded him in their custom trust lists. So he's not on DT right now and chances of becoming one are pretty low.