Are they doing DPI? Or are they just responding to the notices they've always gotten from 3rd parties about infringement on their network with these educational

Are they doing DPI? Or are they just responding to the notices they've always gotten from 3rd parties about infringement on their network with these educational/throttling responses instead of merely passing on the notices. A graduated response system need not involve new surveillance. Most of the notices were from movie studios and record labels hiring companies that participate in torrent swarms, produce logs of all the peers sharing pieces of the torrent with them, then send out notices to the ISPs associated with those IPs.