Similar concerns were raised when "Spearing" was introduced, and questions arose about a "runner" putting is head down in a effort to gain additional yardage. The answers seem to have been found in the covering officials sound judgment and considering the intent of the action he was watching.
The "Targeting" revision is an effort to clarify, and possibly expand the handling of Illegal Helmet Contacts referencing utilizing the helmet as an effort to "take aim initiate contact" with an opponent, as opposed to gaining additional yardage. It seems, once again, the solid judgment of the covering official will be a determining factor in deciding if an illegal act has occurred, or if the contact was incidental and associated with a legal effort to gain yardage.
Sometimes additional language clarifies situations, other times, despite good intentions, not.