It sounds like Comcast is deliberating on where to go with this since their bluff has been called. The correct action would be to drop the complaint and apologize. It will be interesting to see how this develops.
This case is sort of analogous to the GCHQ attack on the Guardian, only this time it is a corporation that is trying to silence a news website that has 'copyrighted' information. It is disturbing how common this type of attack on the media is becoming. It looks like the playbook to censor the media has now become: 1) claim they have classified/copyrighted material, and 2) use that claim to sue/harass them.