It would probably not be theymos to receive such a subpoena, it would probably be the gaw forums (their hosts ect) to receive it as a lot more of the manipulation apparently took place there then on bitcoin talk (because of their lack of ability to censor information).
It already mentioned their own forum earlier in the quote but this seems to br another additional one which I can only assume is here.
It is possible that it is here. However there are a lot of other "forums" that could be much more easily manipulated then there (reddit). I would also doubt that receiving a subpoena is something that is unusual for theymos considering how much commerce takes place here and how many scams there are