But of course to believe that God providentially preserved an inerrant book means necessarily that He preserved it in that inerrant condition. If a copy of Homer’s Iliad was preserved through time, then it was the Iliad that was preserved (with all its characteristics). If the inspired words of Paul were preserved, then an essential part of what was preserved was the inspiration of those words. What is the point otherwise?
Remember that the confessional Protestant take is that Scripture was “by His singular care and providence, kept pure in all ages.” That is why it is authentical.
Wilson, Douglas; Wilson, Douglas; White, James . Debating the Text of the Word of God (pp. 17-18). Simposio LLC. Kindle Edition.