Form those lines i got hte impression that Bwonsamdis realm is in close proximity ot teh Ardenweald, but not directly linked to it, and that the Winter Queen generally dislikes Bwonsamdi, possibly for being morally dubious for own power as opposed to more neutral. He is afterall linked closely to the wild god loa who end up in the Ardenweald, and he knew the Winter Queen enough to adress her personally like he knew her, and felt sure she would take the souls, which is not the kind of interraction you would have with someone who is a complete stranger.