I would generally agree with this.
To your earlier point, how would we, within a game, know/judge repent from "repent"? What if the game writers believe they have written the character in such a way that they have repented, but I as the player profoundly disagree. What then?
From my experience with BG3 EA I think it's fair to say the game will provide us with several paths leading to different outcomes. For example I believe that with Shadowheart we will get a chance to turn her away from Shar (which could be interpreted as a "redemption" of sorts but a Sharran would simply call this "betrayal") OR to sabotage her secret mission causing her to become hostile towards us OR to help her with her evil mission confirming her as a Sharran making her fully and completely evil.
