Your source on [2] does not quite support your interpretation: if you follow the Twitter thread from the beginning, or read Sanger's linked blog post [0], he makes no claims about his own beliefs. He's explicitly considering what one would conclude about Biblical inspiration _if_ one believed what the Bible says about itself. No faith is necessary to consider that question.
[0] https://larrysanger.org/2023/10/on-biblical-inspiration/