Karu (atys)
I have not done the mission myself, but the way you describe it that answering wrong leading mission failure is expected outcome.
The problem is you should have an ingame source of lore information to answer the questions correctly and complete the quest. If you think the quest you didn't even take is ok, cool. I think that's wrong - the quest doesn't work as intended. While Dexton was the empreror, it was right, now that the emperor changed, and you don't have any reliable ingame lore source to know that, the quest becomes broken.
Maybe you should try to complete it, before posting your opinion. Because you really don't understand what you are talking about.