As long as you are at the point of doing laps with your backstroke then this drill is worth a try.
Now I admit that this is not necessarily a drill for beginners but one of the things that beginners in particular, have difficulty with, is getting their body into the most efficient position and part of that is a good head position. If your head tilt is good then your body should be in a more or less streamline state.
If you tilt is too far back you will probably get water up your nose. If your head is tilted so you chin is on your chest your feet will probably be sinking.
Even if you don't manage to get your head in the position as shown in the video you will not have done any harm to you body position.
Give it a try