I'm all for protecting players heads, but this here is the crux of the problem with this dumbass rule; it will be utterly impossible to enforce with any sort of consistency whatsoever. Stripes already has too much on his plate and adding this piece of stupidity significantly compounds the problem.
If there are any young players reading this thread, please ignore this horribly stupid piece of uninformed garbage posted by an individual who has demonstrated time and time again that he clearly has no clue what he is talking about. Keep your head up and see your target, just like your coaches are telling you to. Not only will it protect your neck, it will also make you a better tackler.