That case is different from the case of a Pope who is a contumacious heretic. The author of your piece writes a solid discussion of heresy, and the difference between heresy and a questionable administrative act, but wiffs on the question of what to do with a heretical Pope.
As I pointed out yesterday, some canonists hold that it would be up to the College of Cardinals to act and proclaim that the Pope was -- quite literally -- no longer Catholic and therefore no longer Pope. Others say that God would never permit it to happen so it's not productive to talk about it.
It appears the only way to remove this brazen man is for the laity to hound him out. The collection plates should go empty, the feds should RICO the Church, and the (smelly) sheep need to heckle him at every public appearance.
To a man in such need of public adoration, this would be like death.