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With all due respect, Fr. Paul Kramer has exhaustively written in his two volumes to demonstrate that it is definitive magisterial doctrine that the pubic sin of manifest formal heresy separates the heretic from the Church, and consequently any cleric holding office automatically loses that office and the jurisdiction that comes with it.  On my part, I have given you many quotations from his works and also the quote from Pope Pius XII and the theologians that reiterated his teaching that heresy by its nature separates one from the Church.  Yet you still question whether it is definitive magisterial teaching as if Fr. Kramer just pulled what he wrote out of thin air.  My suggestion to you is to read his works and then rebut if you don't agree.

One who was baptized in the Catholic Church and then separates himself from the Catholic Church by the public sin of manifest formal heresy can return to her through confession and receive absolution.

Is one who is baptized but who separates himself from the Catholic Church by heresy still considered Catholic, in your view? If not, then what would he be called, if not Catholic?