If Francis can be wrong about faith and morals, why not Pope Leo?
I could be wrong, but as far as I can tell, that encyclical *could* be wrong, technically, but I don't see why it would be, as the reasoning behind it is completely sound, and to affirm the opposite opinion would be to say you can validly ordain a sacerdotal priest while intending to ordain a Calvinist minister. I used to be a Calvinist, the difference between what a Calvinist Anglican would see as a "priest" and what we see it as is the difference between night and day. This isn't weaponized ambiguity, this is straight up different conceptions, outright, explicitly, and at times (particularly under Edward VI) Calvinism is where the Anglican Church was at.