https://forgottenrealms.fandom.com/wiki/Absolute_crisisMy experience with the Forgotten Realms is that there's a "hierarchy" of canon. Official adventures are at the top, and video games are usually somewhere near the bottom. This doesn't mean that the events of video games are never canon, only that they are considered canon unless those events are superseded or contradicted by a source with a higher hierarchy.
You can read about it, here, in fact.If your complaint is that there's multiple ways to end the game and therefor you disagree with what ending is considered canon, then you may be happy (or not) to learn that this issue is not isolated to the video games. The canonical end of Descent into Avernus (an official adventure) is not the Zariel redemption ending, despite it being the objectively best one. This has been a thing since the beginning of 5e, because everyone's personal version of the Forgotten Realms is different, based on the choices they make in their adventures. So there is "official" canon, and then there is your/your DM's/your group's personal canon based on the choices that get made. Murder in Baldur's Gate had the same issue.
We've been through this with multiple other games set in FR. Broad strokes over fine details. It doesn't matter if the Kalach-Cha sided with the shadow thieves or the city watch, what matters is that they were instrumental in ending the Shadow War in 1374. Until some further piece of official material comes out that mentions something specifically related to a choice that could be made in game, like the leader of the Sharran church in Baldur's Gate being led by a woman named Shadowheart, it's in flux, and kept vague for this very reason.
