And's matter. There are several letters in Article 4 with and's in them.
The first one is: a. Piling by a player who, in an unnecessarily rough manner, falls upon the ball carrier after the play has been terminated. Any player in possession of the ball, who falls to the ground without contact and is not attempting to advance the ball, may only be touched down and may not be contacted in any other manner...
If the 'and' doesn't matter then there is no reason to add the is not attempting to advance the ball. The and changes the meaning from it's always UR to hit a player who is down to it's UR to hit a player and not trying to advance the ball.
If 'and' means something in case a, it means something in case h.
If the rule is supposed to mean this or that or the other thing, then they'd use OR instead of AND. They could also change it to multiple cases like:
h. Delivering a forcible blow to the long snapper while their head is down
i. Delivering a forcible blow to the long snapper while they they are in a vulnerable position
j. Delivering a forcible blow to the long snapper while they are unable to protect them self
That would match with g. Delivering a blow to an opponent in the neck or head including the long snapper on kicks from scrimmage and convert attempts which is another case that specifically mentions long snappers.
How to you even define what a vulnerable position and what unable to protect them self, means if it's not attached to having their head down?