Since, mysteriously, the full text of Fr Aidan Nichols' lecture will not be made available, we must make the most of the passages which the Catholic Herald published. [UPDATE: See my post of earlier today.]
By the way: that lecture is highly important, and not only because of Dr Nichols' considerable theological prestige. It addressed the points that some of us did our best to articulate in our Correctio. I do beg you to read and reread it, and to pass its teaching on to as many people as you can. [UPDATE: As the bergoglian pressure-machine cranks up into top gear, pressing for a final Result, interventions such as Fr Aidan's ought to be as widely known as possible.]
Today, I give you Fr Aidan's words on whether popes can teach error.
"It is not the position of the Roman Catholic Church that a pope is incapable of leading people astray by false teaching as a public doctor. He may be the supreme appeal judge of Christendom ... but that does not make him immune to perpetrating doctrinal howlers. Surprisingly ... this fact appears to be unknown to many who ought to know better." [UPDATE: I wonder if poor Cupich is aware of this.]
"Doctrinal howlers". Gerhard Cardinal Mueller reminded us ... aptly ... of the abrupt observation of S Robert Bellarmine to the pope of his own day: "Holy Father, you know nothing about that."