They can argue about depositus this and deponendus that til the cows come home, but none of that changes the fact that they attribute corruption to the Magisterium and to the Church's Public Worship.
They might find some who hold to the
papa hereticus deponendus position, but I defy them to find or cite a single Catholic theologian who held that the Magisterium of the Church could become corrupt and that the Church could promulgate and use harmful Rite of Mass that's offensive to God. Just one. You'll find only the Protestants, Old Catholics, and Eastern Orthodox who attribute corruption to the Papal Magisterium. While certainly not every papal teaching has the notes of infallibility, to attribute a degree of corruption that requires severing Communion with the Holy See and forming a parallel (schismatic) organization is contrary to the Church's indefectibility. Sure, I might disagree with a Pope Pius XII's
Allocution to Midwives or his statements about evolution, his 1955 Holy Week revision ... but none of that would come close to rising to the level of requiring that I sever communion with the Holy See and start my own Church. I would respectfully disagree with Pope Pius XII ... from within the Holy Catholic Church.