Certainly. Anything I write about the Realms, by definition, is canon, unless or until contradicted/rendered out-of-date by Wizards-published writing. That's in the original Realms agreement, that Wizards inherited from TSR; Wizards can't change the agreement...
#Realmslore https://twitter.com/Yargniathus/status/1260895088705777669
...without negotiating with me (so I'd know about any change). So it's canon, by definition. (Folks on the FR wiki should know this; it was all explained years back.) The BK book is also canon because Alex Kammer made sure it was okay with Wizards to call it so.
I know some fans like to decide for themselves what's canon or not, in any IP, but no one but players in my home Realms campaign would have seen more than DRAGON-glimpses of the Realms without the agreement, so it's the baseline for FR canon.
You can follow @TheEdVerse.
Tip: mention @twtextapp on a Twitter thread with the keyword “unroll” to get a link to it.

Latest Threads Unrolled: