This. This is exactly why I can't keep picking at this scab. The nature of necromancy is a silly, frivolous debate of course. But the way Blizzard went about something seemingly trivial seems to indicate that the authors themselves lack a single source of truth.
See, the way to responsibly handle a fictional universe, is to build it on top of immutable truths. Axioms that apply to everything in the setting. These axioms are meant to be kept secret, far away from the prying eyes of the fans. The fans only get to see the tip of the iceberg. It can be an inaccurate, unreliable representation of what's actually going on, it can conflict with what other iceberg tips are telling them. But these tips are still attached to massive icebergs deep beneath the surface.
Games Workshop does this. There are like three veteran authors that hold a manuscript/encyclopedia with all the hard cats in the 40k universe. But that information is a strictly guarded secret, even more junior authors don't get to know it. Whenever a 40k author has an idea, they will have to get it vetted by this council of senior authors to make sure it remains consistent to this secret canon.
Blizzard quite evidently doesn't have such a system in place. They may plan their expansions far ahead, but the story itself is ad hoc, and then these types of expositions, even just a few sentences, can cause a rippling effect that damage, if not collapse perfectly good lore that was established beforehand.