No, it exists in the NFHS definition of guarding too:

NFHS 4-23-1 "Guarding is the act of legally placing the body in the path of an offensive opponent."

The understanding is that the "path" qualification also falls under the LGP umbrella because you must first be guarding someone before can establish Legal Guarding Position. Thus if you are not in the path of the opponent you cannot be guarding them and thus cannot establish or maintain LGP.