Maybe a troll? To “accidentally” let it leak that they have means of reversing death? Perhaps to generate wildly false conspiracy theories? Just guessing. It was a weird thing to say.
What? I know some in those comments said something regarding necromancy (which is a real thing, King Saul did it through the witch of Endor), but I was only alluding to the notion that it may a phrase related to some weird occult nonsense.