For me that definitely puts them in the Novelverse continuity, and I guess that would make Imzadi II part of it too then.
Not necessarily. There are books in the main novel continuity that reference elements from books that are now out of continuity -- like all the Final Reflection nods that KRAD and other writers (not to mention Ron Moore in DS9) have incorporated into their Klingon tales, or Diane Duane's Janice Kerasus character showing up in an SCE story.