This sounds goofier than a three-headed fish.
There were free-love sects of "Christians" who practiced orgies, those who went about "naked for a sign", a revival of Arianism, two-seed theories that still have adherents today, etc.
It doesn't surprise me that such a manuscript could have emerged in those days.
Man, the threshold for 'ancient' is pretty low, huh?
Being a church organist, I find it interesting that "Aberystwyth" is the hymn tune name for Charles Wesley's hymn, "Jesus, Lover of My Soul."