Foreign readers may need to "bone up" upon what is meant by "Cockney Rhyming Slang". It is our demotic equivalent of that propensity to slip into Latin which used to be common among our educated classes in the time when ... goodness, how I do woffle.
The first and fundamental Porkie in Traditionis custodes is that Benedict XVI permitted the Usus Authenticus as a kindly concession to those who felt the need for it.
This is untrue. Benedict revealed the verdict of a canonical commission which had found that the 1570 Rite had never been properly abolished in proper canonical form.
The Old Rite was never abolished!
Any reworking of Summorum Pontificum clearly needs to begin conceptually from that remarkable revelation.
In addition to that canonical fact, Papa Ratzinger added a dogmatic assertion. He did not say that his successors ought not to abolish the Old Rite: he asserted that it cannot be abolished or forbidden. In other words, that an attempt to abolish it would be ultra vires.
"CANNOT". Pope Benedict really did mean what he said. When he was Cardinal Ratzinger, he had launched a scathing attack on the impression "that the pope really could do anything in liturgical matters, especially if he were acting on the mandate of an ecumenical council." And, before that, he had reminded us "that the Church, throughout her history, has never abolished nor forbidden orthodox liturgical forms, which would be quite alien to the Spirit of the Church."
I suppose it is hardly surprising that PF fails to understand the simple proposition that the pope cannot do anything.
But, surely, even he must see that, if he can so disdain the doctrinal teaching of his predecessor, he is sawing off the branch upon which he is himself so precariously balancing.