I don't know why they haven't changed that. They always change Jesus's words.
Jesus said after his resurrection: " All authority has been given me in heaven and on the earth" (Matthew 28:18) But the Watchtower says that it was until 1914.
Jesus also said that all his followers have to eat his flesh and drink his blood: " Whoever feeds on my flesh and drinks my blood remains in union with me, and I in union with him" (John 6:56) But the Watchower says that only 144,000 have the right to do it.
After all the law suits coming their way and all the millions they will lose, the GB will get new light: " Two witnesses are not required Jesus' words don't mean a damn s**t to us".