Why let the cat out of the bag so early on? PJ surely knew it would be controversial, so did he admit the Scouring was out in order to prepare us for it? Or did he kind of want to know what fan reaction would be to its removal?
Probably too late to invest in the sets and time to film the scouring if it wasn't done originally. I think they have already packed up and abandoned the Shire set, so probably the "preparation" motivation!