It is really weird, he says it was his idea then he says it was Studio Pierrot's, then he says the movie was in making for two years. Nothing makes sense anymore. He also said he didn't care for Naruto and Hinata's love story, I don't know if he's lying or telling the truth anymore to be honest.
His is suffering from depression. Not only his father passed away but I heard on Twitter that his marriage is also failing. If that was the case, the editors should have told Kishi to go with the open ending and seperate NH and SS from the logics of the manga.