Agreed.
So please explain, how is it that one who rejects the errors of the pope, rejects his authority? Since you say, he can not bind anyone to his errors. Sounds contradictory to me.
What I am saying is that the Holy Ghost prevents the Pope from binding the Faithful to error.
First, I have the promise of God that He will prevent the Pope from ever binding me to believe error.
Second, I have the command of God to believe and obey what the pope tells me I must believe.
Third, to paraphrase Pope Pius XI, the command from God to believe cannot even be understood unless I also have the guarantee that what I am asked to believe is free from all error.
Nowhere in either the promise or the command is there any room for my own private judgment.