For the final three episodes of the show, I think it is easiest to say that because we’re at the end game, almost anything may be a spoiler for the books. Character deaths, of which there are a couple significant ones in this episode, are probably highly indicative of future deaths in the books, though time, place and manner of death may very well not be. However, it is also clear that the omission of certain plotlines from the show has led to an end game that is very likely to have a significantly different structure from what is planned for the books.