The video you posted shows the guy turning on the downlink. The downlink isn't necessary to calibrate the compass. Most quadcopters have a 2.4 ghz controller and a 5.8ghz downlink. The video you posted depicts a Phantom "vision" 2 which is reversed frequency wise. This is why I'm not a big phantom fan. Too many variations now and could really hurt a beginner.
The Phantom 2 is not the same as the Phantom Vision 2. What worries me is that someone could possibly confuse the two and have a radio problem, get a new radio and have it be the wrong frequency because he ordered the Phantom 2 tx when in reality he has the Vision 2.