You seem to be arguing the because Borg quoted from Paul or referred to it as the Word, then he was calling them Scripture, just as the writings of Isaiah were.
However, church ancients also referenced books which they rejected as being part of the canon, and sometimes even called some of them Scripture, but not in the formal sense, versus those which were to be used in the church.
And Borg himself states in his verbose Arcana Coelestia (10325):
The books of the Word are all those which have an internal sense; and those which have not an internal sense are not the Word.
The books of the Word in the Old Testament are the five books of Moses, the book of Joshua, the book of Judges, the two books of Samuel, the two books of Kings, the Psalms of David, the Prophets Isaiah, Jeremiah, Lamentations, Ezekiel, Daniel, Hosea, Joel, Amos, Obadiah, Jonah, Micah, Nahum, Habakkuk, Zephaniah, Haggai, Zechariah, and Malachi;
and in the New Testament the four Gospels, Matthew, Mark, Luke, and John; and Revelation. (www.sacred-texts.com/swd/ac/ac207.htm
Again Dave - the Borg states the other books are NOT the word. Please cite where the Borg reversed himself and added these books back in. Should be simple.