Jacob Peterson's explanation was vague and contradictory and short on facts, so nobody should have been "convinced" of his false claim.
Peterson was so confused that he even started talking about good and bad texts.
That was a doozy.
Sounds like he was listening to Wallace talk about Westcott-Hort Alexandrian texts.
Along with:
A super-doozy.
A major part of trying to counter Simonides was to claim that the manuscript was in an ancient physical condition.
The Clerical Journal Oct 2, 1962 published in the Journal of Sacred Literature, April 1863
https://books.google.com/books?id=ybYRAAAAYAAJ&pg=PA490
Similarly, the posters here are continually struggling to try to claim the physical condition supports Sinaiticus being old, despite its youthful, flexible, wonderful parchment, and a New Testament not even missing one word.
So if Peterson were right, how would you tell if a manuscript was old, if you leave out the physical condition?