In any case, that is very typical IRC conversation for a large portion of that subculture. They joked about doing these things, but they didn't actually take steps to do them. He considers himself a satirist, so it's not much different than some comedians talking nonsense over beers and having it show up in an indictment.
One of the chatters observing said they should post the list to full-disclosure. Weev replied saying "no, don't do that, its potentially criminal." He then talked about how he gets to spin it in the media and he's won. That says pretty clearly that he was only out to make a scene, which is what he has always done.
Also, Weev himself says that he is unwilling to short AT&T's stock - I think he understood the ramifications that would have.