Ratzinger has referred to the Word (Scripture) in ways which might support the position of your interlocutor, in R's discourses on Sacred Music.
I don't think Ratzinger would assert that Scripture is the sole way that we have of knowing God. Which was what started this whole thing. Nor that Scripture is God. Scripture is an expression of the mind of God, but it is not God Himself. God can be present during Scripture study and reading and can enlighten us through His written Word.
But the Bible is not God.
SD