While I can see the Governing Body bend this to their purpose (and I agree with you that this is just a set up in order to more plainly say this, using this information as a sort of "stepping-stone" introduction), but this is actually highly interesting because it is the official Roman Catholic interpretation. The Catholic view borrows slightly from Judaism.
Accordimg to the Catholicism, God's Word is not limited to what is written in the Bible. It includes all that God expresses and has expressed, even if it wasn't recorded in Scripture. It is commonly called the "economy of salvation," and the "Deposit of Faith."
For instance, Catholics understand the canonization of Scripture as part of this. Not only are the books of the Bible inspired, but for Catholics the creation of the list of what is included in the canon was also created under direction of Holy Spirit or equally inspired. Though the list of Bible books of the canon does not appear in Scripture itself, the canon is no less a product of inspiration to them. Such, in effect, is the "Word of God," part of the Deposit of Faith as they see it. This includes not only the written Word but the Apostolic Tradition, such as the canon, that comes equally from God and thus things like the canon hold the same authority as Scripture to Catholics.
Some of this is similar to Judaism that sees not only the Hebrew Scriptures as the "Word of God," but their religion and, for some, the "oral traditions" or Oral Torah as part of that same "Word."
To a degree it is only logical for these ancient systems to do this as they both predated their unique canonical texts. For Jews and the Catholics/Orthodox, Scriptures were added to their religious systems as they were composed by members. The way they explain that they could be validly added to their religions was claim that it was done by means of 'God's expressed Word,' though not holy writ.
So it is significant to find this in the Watchtower...and dangerous. Now the Governing Body can use the same type of reasoning to declare that anything they "express" equals in authority to God's written Word. While the other systems used such reasoning to explain how they came to include Scripture as it was produced, the Governing Body will likely use this same reasoning to include anything they wish to say.
I wouldn't be surprised if the GB start to claim that their current words in the Watchtower will compose "the new scrolls" according to their peculiar interpretation of Revelation and thus must be seen on par with or more important than the Bible.