Indeed, what I gather from the etymology of the word "necro" is that its usage as a prefix entails death or corpse.

Exactly.

Official Lds.org Web site: Gospel Principles: The Postmortal Spirit World: Definition of 'Spirit Body' per official Mormon teaching:
What Are Spirits Like?

Spirit beings have the SAME BODILY FORM AS MORTALS EXCEPT THAT THE SPIRIT BODY IS IN PERFECT FORM (see Ether 3:16).

Now why is this quote relevant to our discussion?

Because StormPrepper, the Mormon, is attempting to make a big deal about attempted LDS interactions with dead bodies...

Whereas most people tend to think of a "spirit body" as distinct from a "physical flesh-and-bones body", the Mormon church itself is unique in that Joseph Smith taught that the "spirit body" is the SAME PHYSICAL bodily form as "mortals."

Hence, these dead people, per Mormonism, already have PHYSICAL bodily forms...only these corpses have been perfected.

Christianity holds to an eventual similar teaching -- but futurizes perfected physical bodies until the final resurrection.

"Necro" simply both historically -- and currently -- has ONLY had two meanings: "Dead" and "corpse"...and, given that "corpse" comes from its root "corpus" (which just means "body")...
...and the Mormon church teaches that dead spirits have such corpuses (physical bodies)...
...this shows exactly how spurious this Mormon apologist wannabe argues.