That is the suggestion of Francis Watson. Mark “Scoop” Goodacre has posted short papers by Watson explaining his theory on the Gospel’s modern creation:
A more technical article employing Coptic here.
An Intro and Summary using only English for non-scholars here.
Watson’s theory is the fleshing out of something many of us had noticed about the Coptic fragment. Still, one would prefer to have lab tests proving a modern fake rather than just this admittedly convincing paper. I say that not only because lab tests are more definitive, but also because a good skim of something like Stroker’s Extracanonical Sayings of Jesus does make one feel that the ancients borrowed and recombined a lot of sayings of Jesus (just not to the degree seen in this fragment).
UPDATE: Watson has added a third brief paper examining the line breaks in the Gospel of Jesus’ Wife and how they might indicate the fragment is a modern fraud. Watson also makes clear his stance that the best stance regarding the fragment is skepticism awaiting further proof one way or another.
