Getting back to topic ,I don`t think this fact has been brought out in Previous posts on this thread.
The "kingdom Interlinear Of The Christian Greek Scriptures " published by the WTB&TS a word for word translation of the Greek Text into English that was a basis for there NWT of the Christian Greek Scriptures does not contain the Hebrew Tetragrammaton or even a corresponding Greek equivalent of those four letters representing Gods name.
The simple fact is the Divine name Jehovah/Yahweh is not there in their own publication KI. ( the New Testament )