He had negative trust for account selling so maybe he was not seen as a good CM by his bosses.
They put an archive link with your trust. Yes, it seems you didn't buy or sell an account but you offered escrow services. It seems people give that trust to you think it is same. Still, i find trust system absurd.
Exactly, you offered yourself as an escrow and with that you were involved.
https://bitcointalk.org/index.php?topic=3233304.msg33828602#msg33828602
If it was a joke, you should contact them to remove your negative trust.
Since it was in russian language I also didn't recognize, that it was a joke, because I used a translator.
And they obviously did not understand the joke, otherwise they would not have given the negative trust.