That contradict ~30 years of Forgotten Realms lore. I would be rather surprised that WoTC would just allow the devs to change that. Even more curious, the place where we find him was a Selûne's chapel just a few months ago (in demonstration) and everything related to that is still in the game files.
I honestly don't know how accurate these descriptions are. Just that he is called Jergal in them and all his files say 'Jergal' also. As for the tomb itself, there a dialog with Shadowheart: PC: The air's stale. It's been centuries since any prayers disturbed it. SH: Who were those prayers for? Normally the patron god is obvious - not here. And there is Jergals statue, so at least this particular room hasn't been dedicated to Selune lately.
