Exactly. I’m not sure what this author is trying to prove about a difference between Scripture “being the Word” and “containing the Word” but it is clear that the Logos (Word) preexists even the wrold, and was made flesh via the Son.
Simple (maybe overly simple, but simple) answer: if the Bible "contains" the word of God, then there are parts of the Bible that made it in, not on the basis of God's will, but human cultural additions. To put it even more simply, if the Bible "contains" the word of God, you don't have to worry about all those silly anti-homosexual-act references, or how divorce is a really bad idea, or wives submitting to their husbands (or husbands having to love their wives sacrificially), or how God loves Israel and will whoopa$$ anyone who attacks it, etc., etc.