Actually I will have to respectfully disagree. The idea of heads up display has to do with taking your eyes off what you are doing, the actual tilting of the head has nothing to do with it. Whether you move your whole head or your eyes off of what you are doing your still not watching where your going and distracted.
You are 100% correct. If it was projected on your lens it would be a HUD. This is just a tiny screen in an awkward position.