I don't see a dry delivered joke at all? But could be because I'm British and we do it as better as it's a national pasttime. He's explaining to his chat that he has done things that are informant stuff. The best I can come up with here is it's intentional planned trolling but it seems like the kind of thing you'd realise beforehand is a bad idea to joke about because nobody jokes about being a fed when they are legitimately under scrutiny for being a possible fed. It just muddies the water and gives people reason to be even more sceptical of you.

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