We were talking about the official ways, according to Tradition, that a pope can vacate his office. Your doctrine isn't included as being one of the ways in which a Pope can vacate his office, and never has been. Your doctrine is novel.
No, it is not novel, it is what being a heretic, schismatic or an apostate is. When some willfully consents to being a heretic, schismatic or apostate, they make a free choice to leave the Catholic Church. The person committing any of these three sins separates themselves from there Catholic Church. The difficulty is that now there are people that choose to be either heretic, schismatic (or both) and some even choose to be an apostate and yet want to keep their clerical position within the Church so as to destroy it.