The fragment was dated to the 4th to 8th century, so it could very well be some wild gnostic nonsense of the time, rather than the gnostic nonsense of today. However, and science notwithstanding, I still suspect the later.
You’re right. There were many outlier ‘gospels’ written by some unknown for some unknown reason. No reason to give it any credence.
You state what I was thinking; i.e. Gnostic nonsense. False stories and doctrines began almost immediately both during and after Christ’s death. The Bible tells us that; i.e. calling Jesus a winebibber(SP?) etc.