From what I understand from reading that site, it's meant for hearing people to use when talking to a deaf person when they're in the same location, which is called "Video Remote Interpreting" or VRI for short. The site doesn't say anything about any kind of video phone or relay services. But you're right, it's kind of like VP, in a way, I guess. They don't use videophones like a VP though.
Their goal seems to be more of interpreting for police when they pull over a deaf driver to give a ticket, or medical interpreting for deaf patients to talk to a doctor, or court interpreting when a deaf victim has to give testimony in a trial.