Now to say, as Rippon and his man Philip Comfort do, that the extra words were a later emendation by a scribe, means that The Holy Spirit made a mistake originally which a man had to correct. I do not find that acceptable as a point of view.
No. I think it is much more likely that the error occurred very early on and has been corrected a little later and so the reading in the huge majority of manuscripts is the true one.
It is much more likely that the original reading was in found in the oldest manuscripts that we have. Extra words were added by zealous scribes who thought they were "correcting" the Word of God. There were numerous attempts at "correcting" many other texts in the RT tradition as well.
The Holy Spirit most certainly did not make any mistakes in the original.