The part I don’t get is why there is any confusion about universal acceptance.
The theologians who used the term explained what it was (moral unanimity among the bishops), yet some still declare their mystification?
I’m also confused by Stubborn’s position that a papacy is a dogmatic fact, but contrary to the unanimous opinion of approved theologians who opine that it is this consent which imparts to the papacy the quality of being a dogmatic fact, he says they are wrong. I doubt he can cite a theologian saying otherwise (since they are unanimous against him), but he offers no other explanation in its place, such that to be at least consistent, he should be arguing that either there is something about the conciliar papacies which is fundamentally different from all other papacies which robs them of the quality of being dogmatic facts, or that no papacies are dogmatic facts (a position he seems to comes close to several times when he notes the term has only been around 150 years).