TL;DR Yes. The ISP knows that your IP is connecting to the IP of a TOR relay. (EDIT: the ISP is technically renting the IP address to you, so they obviously kn

TL;DR Yes. The ISP knows that your IP is connecting to the IP of a TOR relay. (EDIT: the ISP is technically renting the IP address to you, so they obviously know it.) And the admin of your network knows it too, which is exactly why the guy got caught.