Force blessing

Might be a dumb question but my friend told me in a game a whole unit that is with my Walock gains the Instant death special rule if the cast goes off, I showed him the card and said its only for units that have a "force" weapon, so in that case my Dire Avengers don't get the Instant Death Special rule. I am correct am I not? He was so sure I was wrong I have been second guessing myself lol