Comcast says its attempt to shut down TorrentFreak by claiming copyright on court filing was "error"

Companies send automated letters like this all over the place (look at all the places that have received DMCA takedown notices due to automated bots thinking that Cory’s “Homeland” novel was an episode of the TV show “Homeland”).

Having said that, this particular one seems like it would be hard to “accidentally” send out in any kind of automated way.