Shadow Intentions - can the unit be damaged by event / card ability?

I can't find the answer about the Shadow Intentions card effect.

The upgraded unit can't be captured, defeated or returned. It seems obvious, but can DMG from an event be dealt to the unit upgraded by shadow intentions and ultimately killed? Lurking Tie Phantom effect says it can't be damaged by event. From my understanding , damage dealt by event/ unit ability can't defeat the unit. Is this right?

We can't have a consensus here.