The new Remaster Spel Infuse Vitality (which seems to be the new version of Disrupting Weapon) says
You empower attacks with vital energy. The number of targets is equal to the number of actions you spent casting this spell. Each target’s unarmed and weapon Strikes deal an extra 1d4 vitality damage. (This damage typically damages only undead, as explained on page 409). If you have the holy trait, you can add that trait to this spell and to the Strikes affected by the spell.
Emphasis mine.
Since the Holy Trait is added to the Strikes and not to the Vitality Damage, it should make the Strikes trigger Holy weakness of fiends, even if they are immune to the vitality damage, correct?
