"The Pope is the Head of the Church. How, then, could the Church be an authority superior to the Pope?"
He is a steward, not a potentate.
When I say "the Church" I am including the Church in its existence as the supernatural bride of Christ, as well as the Deposit of Faith.
If we accept your position, then we are left with the proposition that a Pope could order us all to worship Gaea as the Supreme Being through ritual prostitution and drunkenness.
I'll wait until he does that and then be at the head of the line of those who disobey a commmand to sin. But no pope has ever done this and to imply that the post-Vatican II popes did so is calumny for which you should be ashamed. And no,Assisi did not involve a command to worship Gaia, so please spare me that claim.
In calling on Archbishop Lefebvre to refrain from ordaining priests and bishops the pope was not asking him to commit a sin. To have refrained from the ordinations would not have been to worship Gaia. It was Archbishop Lefebvre's prudential judgment that he needed to ordain those priests and bishops. The pope believed otherwise. To have acceded to the pope's judgment would not have involved a sin on Lefebvre's part unless one has already concluded that the pope was leading the Church into apostasy and that to accede to the pope's position would be to apostasize. But to make that claim is to join Luther and the other Protestants who distinguished the apostate "papal church" from the true church.
I'm beginning to believe that you really knew and meant your claim that the true Church can somehow be separated from the Petrine office. That's pure Protestantism. Please tell me you have thought better of it and no longer make these claims.