red resonator vs number 81

red resonator: When this card is Normal Summoned: You can Special Summon 1 Level 4 or lower monster from your hand. When this card is Special Summoned: You can target 1 face-up monster on the field; gain LP equal to its ATK. You can only use this effect of “Red Resonator” once per turn.

81 :Once per turn, during either player’s turn: You can detach 1 Xyz Material from this card, then target 1 face-up monster on the field; that target is unaffected by card effects, except for its own effects, until the end of this turn.

el resonator selecciona al 81, ya protegido por su propio efecto, para ganar vida. ¿ Es un efecto que no “afecta” al mostruo y solo necesita targetearlo para ganar vida, o como no le afecta no se aplica y no gana la vida?

No afecta al monstruo en nada, por lo que se resuelve normalmente ganando vida.

ok thnks