Except it isn’t.
Even if such a power was given to Peter, it wasn’t necessarily given to any who came after him in the pretended succession of the Catholic church.
Such a power may have been given to all who believe, to all who realize “Peter’s Confession”.
It was many years before the Roman position of Pontifex Maximus was given to any Christian. Peter never had it.
Come on now, those Italian banking/trading families can’t be wrong ! lol.
Oh, and, making your 12-year-old grandson a cardinal... well, that’s just what Peter would have done !