Peter, according to Acts, was unschooled. So, an illiterate could not have written anything.
Also, there were no writings or a gospel from Paul that Peter could read. Paul wrote letter to various folks. So, Peter could not have read any of his letters.
It is reported by scholars that even half of Paul's letters were not written by Paul.
For example, Hebrews was not written by Paul.
2 Peter was written in the 2nd century and plagiarizes heavily from Jude, also a 2nd century pseudograph.
Acts describes John and Peter as unschooled. Yet if one does not rely on Acts but accepts the description of Peter in the canonical gospels as common laborer, 1rst century Palestinian laborers rarely received any literary education, let alone education in reading and writing a second language -- Koine Greek.
And so even the apology that Peter used a scribe fails. Peter, a real person, was long dead before the 2nd century and could not have plagiarized a 2nd century Greek text, Jude, even if relying on a scribe.