I don't know if you read my rather long post on the astrologian questline, but the short version is that the *first* lorebook already apparently tried to retcon that quest's timeline. (Either that or they somehow failed to cross-check their character profiles against what was said in the quests.)

I wouldn't mind if they had to retcon something (occasionally) if they fully announce it and say "okay we got this wrong, please ignore the information in X, here's the correct version". I'm sure it must take an incredible amount of planning to keep all these plotlines running over years, and keep everything consistent.