Hello fellow muslims i was reading the quran and stumbled upon this verse "and thou wast not (able) to recite a Book before this (book came), nor art thou (able) to transcribe it with thy right hand. In that case, indeed, would the talkers of vanities have doubted." 2948

Now i know it is mostly agreed that "ummy" in other verses refers to the prophet being unscriptured or unlettered but this verse seems to assert that the prophet could neither read or write until the Quran came to him and that his illiteracy is indeed proof of the Quran's divinity as the Sunnis claim. Am i right or wrong ? nope