Thanks for posting, I've removed him from my trust list for now and will tell him about the situation.

I added him to my trust list earlier because he is offering a trusted escrow in the German local board for very long and he left some feedback about the trades so I thought it would be good to have his ratings visible in the German community (DT2). He did also some group buys where he purchased miners for solo mining and splitted the profits to the investors (similar to LoyceV's 10 Altcoins challenge but for mining) https://bitcointalk.org/index.php?topic=1348143.0

I wasn't aware that he set all the users he traded with on his personal trust list and that isn't how DT1 works to add everyone there. It doesn't look to me that he did so to push his trust rating, only a confusion of trust list and sent feedback.
Removed for now and will tell him to review it.