I played the game again this morning looking at some of the details again, and I noticed that Zevlor is a hellrider exile. I also found records and documents that state that Elturel went to Avernus already and is now back and the tieflings were expelled because of extreme prejudice there.
So I looked up Elurel and hell riders and the whole backstory about the city. Timeline wise it doesn't line up either with the timeline that has been given in Baldur's Gate 3. According to the timelines I could find on various sites, the city was not sent to avernus until 1494. However the Baldur's Gate 3 time frame is 1492. So unless the websites I found are wrong, which is entirely possible, we have even a discrepancy as to when these major forgotten realms events occur. Also, would Zevlor have really been allowed to be a hellrider?
Finally, let me clarify my suggestion. I do not want Larian to provide us with specific timelines and so forth. My suggestion, is that if I do dig in a little into the story I find that it is without confusing details or discrepancies. It would also be nice if there was at least some more clear definitions of when things occur. In other words if someone tells me that Halsin left a little while ago, that is not clear. I would like for them to tell me something more like he has been gone for almost a month now. That is something very simple and minor but it now gives me a better idea of the actual time frame that things are occurring in. When Alfira tells me that her mentor died during the gnoll attack, she could make a comment that it happened now over 2 months ago but it's still affects her deeply. Those are the kind of things I'm talking about. Minor additions to dialogue that give players a frame of reference of how long ago things happened.
