I see is still mentions land based telphone line, but I see they have now added land based internet connection as well:
For optimal performance of your Receiving Equipment, including ordering with your remote control or receiving certain Services, your equipment must be directly connected to the same land-based telephone line or internet connection. If you add Service on additional TVs, you may purchase a separate subscription for each additional TV, or, if all your equipment is continuously connected to the same land-based telephone line, we can “mirror” programming to your additional TVs and charge you only the fee amount described in Section 2. You agree to provide true and accurate information about the location of your equipment. If we detect that any equipment is not regularly connected to a land-based telephone line or internet connection, we may investigate and, if it is determined that the equipment is not at the location identified on your account, we may disconnect the equipment or charge you the full programming subscription price for the equipment.