“...there has not been a valid papacy since 1958, but I do not find it convincing.”
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The apostles creed states that there will be the resurrection of the body.
Mr. Ratzinger claimed to be pope while holding that there is no resurrection of the body.
Is he free of heresy?
Pope Benedict XVI would never say that there is no resurrection of the body.
Where did you get that misinformation? Or did you misinterpret something?
Here is the citation if you need it. He denies the bodily resurrection of the just at the Last Judgment. They will merely "be remembered in a special way in the ind of God". It's listed after he chips away at Our Lord's actual and Bodily Resurrection.