Originally Posted by Fox of Embers
The issue is that we already have things in the game that contradict the books.
And I have yet to meet anyone who has anything even decent to say about them...

On Edwin's page from the book whose pages I posted here (and which you claimed is not canon) there is information that has all been converted to BG3.
We know it's true because it's already been confirmed in the game. So it looks like the book is canon, at least for larian studio.

This is a moderate spoiler, so read at your own risk.

[Linked Image from i.ibb.co]