They're not retconning Glint, they're promoting her; giving her tale new twists and thus expanding her role in the series (and she was already rare being a survivor of the transition from GW to GW2).

Honestly I don't know how anyone can impune depth of lore and storytelling over the revelation that an enigmatic NPC might *shock horror* have been other-than-truthful when describing herself as agent of the gods and shepherd of humanity.

I fear we're all doomed to another generation of 15ft tall glowing-eyed death-metal lunatic antagonists if there's outrage over the slightest deviation from "BWA HA HA, WITNESS MY OBVIOUS VILLAINY" narratives.