Ill summarize my point; this applies to the papal bull you reference and anything Francis says:
Catholics must not obey any pope on those occasions when his teachings are not in accord with Holy Scripture guided by tradition and reason.
However, Unam Sanctam does not allow the Roman Catholic that option.
Unam Sanctam was a far reaching power grab of the pope over all aspects of life.
Nor does the "ex cathedra" defense come into play in attempting to avoid the command of the bull.
You say the pope's teachings not in accord with Scripture guided by tradition and reason, are not to be followed.
However, there are examples in Roman Catholic history where the pope has issued statements that go beyond Scripture.
As the laity in Roman Catholicism cannot render their own judgment of either Scripture or the accuracy of a pope or "tradition".....how do you judge what your pope is saying and doing is wrong?