As Cyrus the P says, this passage they have removed, in all probability does not belong in the Gospel of John. Have the W.T removed the verses (Long Conclusion) at the end of Mark ?
And, as Cold Steel says above, once you start making this kind of decision, where on earth do you stop ?
With all the editing/redacting etc that has gone on, if you established some kind of rule for rejection, and then followed it through in all of their Bible, you would not have a lot left !
As usual though, the W.T picks and chooses its own Bible, without recourse to logic, scholarship and even common sense, or with any regard to truth.