The Petrine Succession Does Not Fit the Vatican One Claims on Infallibility

From christian idealism, he's a catholic. I met him in person. He's awesome. Go check out his channel, christian Idealism. It's a lot of good stuff there. All right. Ok. What would be your response to the objection that the petrine succession of the first millennium of the church does not fit vatican one claims on infallibility? "Because it's left so vague, i don't know which particular claims are allegedly not their s"