Why remove it from the census? The book still exists, right?
They still exist, in that I don't think the owner shreds the book.
It's just that if a book is removed from the slab, no one tells CGC, and then the book is resubmitted and reslabbed without telling CGC that it was previously slabbed, then there will be doublecounting in the census. What COI's doing is fine, because if he does resub at some point, he'll provide the old label, so that CGC can drop the old book from the census at the same time they add the new book.