I would think that, if BL removed the listing, it would also be gone from your shelves though, so relying on BL (or Goodreads) as a catalog of your fanfic reading isn't necessarily a good idea if there's even a chance they might later remove the work. Also, it'd be a good idea to list the title and author of the fanfic in your post title or at least in the review itself, because removing the listing would probably also remove the cover image/link at the top left of the review post.
On a serious note, tho, make sure to backup every other week and keep an eye on book count :(