This strikes me as unlikely. Perhaps they can track some of it, but IIRC many torrent clients will use random ports and end to end encryption which is there to evade traffic shaping.
My router has various features to block P2P traffic, as an experiment I tried enabling these features and then downloading torrents (Linux distro ISOs). Every time I enabled these the data rate on the torrent client would start to drop, but then within minutes it would be right back to full power again. At the end of the day you can just make a bunch of connections to port 443 on a remote host, start an SSL session and you are now indistinguishable from HTTPS traffic.
The only way I could effectively block it was to disable NAT and force everything to go through an HTTP proxy.
My router has various features to block P2P traffic, as an experiment I tried enabling these features and then downloading torrents (Linux distro ISOs). Every time I enabled these the data rate on the torrent client would start to drop, but then within minutes it would be right back to full power again. At the end of the day you can just make a bunch of connections to port 443 on a remote host, start an SSL session and you are now indistinguishable from HTTPS traffic.
The only way I could effectively block it was to disable NAT and force everything to go through an HTTP proxy.