Anybody who says that this proves that Peter considers Paul's writings as scripture. Number one, the entire book of second Peter by almost all scholars is considered to be a forgery. It's not even written by Peter at all. Number two, the word scripture means writings. Scripture back in those days did not mean what it means today. You compare the book of Acts to Galatians, what Paul says even himself about Peter. It doesn't seem like he got along with Peter very well. And Peter as well, how he treated Paul in Acts chapter 15, especially. And in Acts chapter 21 as well. In Acts chapter 15, he wasn't even given a word in adjoice. He was not allowed to even give his position on the matter of the Gentiles by Peter or by James. There is a lot more evidence that Peter wasn't all that endorsing of Paul, at least not in everything that Paul said.