Reddings Guide says this: " New in 2023 The definition of the above types of receivers has been expanded to include all contact which is not: Incidental contact as result of making a play on the ball; Initiated with open hands; An attempt to tackle by wrapping arm(s) around the receiver (2-32-16d). "
The aforementioned 2 types of receivers are: 1) a receiver attempting to catch a pass who has not had time to clearly become a runner; and 2) the intendedreceiver of a pass in the action during and immediately following an interception, or potential interception.
Haven't received thw 2023 Rule book yet, but unless there's a change to NFHS 2-4-1 a pass is either complete, or incomplete. As for expanding NFHS 9-4 regarding contact with a potential receiver, either the expanded definition to include a receiver's "defenselessness", and enforcement spot seems logically to follow 2-4-1. If illegal contact, as now including a receiver as being defenseless, occurs prior to a pass being complete the enforcement is from the previous spot, if after NFHS 2-4-1 has been satisfied, enforcement would be the spot.
If the contact was deemed illegal, on a yet to be completed pass, it would seem like Pass Interference would (also) apply). If the illegal contact occurred on a completed pass, it would seem a Personal Foul would apply. The object seems to be recognizing the illegality of unnecessary/defenseless contact, and the recommendation to
consider excusing incidental contact with open hands as an exception to the defenseless nature of the receiver (but may still remain a consideration for Pass Interference). Seems like more of a language issue, other than call attention to a problem are, that apparently need emphasis.