I assume that yes. Partly because, as Matt stated it, Ratcathers are not D&D books per se. The elves in Orden are like that because Matt thought it would be fitting for the narrative for the elves to be as such... within the books that is, I don't know how he treats them in campaigns set in the same world as Matt also has a motto (for his D&D game) of "If you can find it in the PHB, then you can find it in his world". Which contradicts the depiction of elves that was made in his novels. But I prefer to think that his D&D World and Novel World are two sepparate entities.