I was directed to this section from Denzinger (388, 13th ed., 1954) to emphasize that BoD is taught as doctrine. BUT, of the variety proposed by the Doctors, NOT the Pelagian variety that has infected trad clerics.
This was added to Denzinger by Rahner, and it's of dubious authenticity. On top of it, IF it's actually written by THE Pope of even A Pope (it's disputed whether it would be Innocent II or III), it's clearly not a Pope teaching with HIS Apostolic authority but as a private doctor, stating that the faithful SHOULD hold the opinions of the Fathers. Evidently this "Pope"(?) thought that the 6-7 Church Fathers who explicitly taught against BoD were chopped liver ... or else simply wasn't aware of them, as most in his day were acquainted primarily with St. Augustine.
On top of this, the doctrine here is a "Baptism of Faith" and makes no mention of any kind of
votum for Baptism, as -- what? -- he didn't know he hadn't been baptized.
Best I can make of it is that this man was ordained a priest and then later (after his death?) it was ascertained that there was no record of his Baptism.
But even Rahner has to admit that it's "of uncertain time" and "ascribed to" Pope Innocent the III. [in your text] Actually, the more common attribution of this is to Innocent II.