Rule 21.1 - Match Penalties
A match penalty shall be imposed on any player or goalkeeper who deliberately attempts to injure an opponent in any manner.
That's not how it is interpreted.
I agree the hit should be banned, but until the NHL creates a rule barring headshots there is nothing Campbell can do.
If you want to interpret that rule "In any manner", then say good bye to Kronwall open ice hits. That was put in place to add discipline to hits that in the rulebook are deemed to be illegal and have caused an injury. That rule was not put in place to counter legal checks that for lack of a better word were "too hard".