I have no clue why you quote a man who 'understood' the scrptire so 'spiritually' he became a Gnostic, and how this relates to the Septuagint.
You recall that one and the same Word of God extends throughout Scripture, that it is one and the same Utterance that resounds in the mouths of all the sacred writers, since he who was in the beginning God with God has no need of separate syllables; for he is not subject to time. - Augustine of Hippo, 5th century
"Every part of Holy Writ announces through words the coming of Our Lord Jesus Christ, reveals it through facts and establishes it through examples. ..For it is our Lord who during all the present age, through true and manifest adumbrations, generates, cleanses, sanctified, chooses, separates, or redeems the Church in the Patriarchs, through Adam's slumber, Noah's flood, Melchizedek's blessing, Abraham's justification, Isaac's birth, and Jacob's bondage." - Hilary of Poitiers, written around 350 AD
This silly argument was never the view of the church fathers-even the Gnostic ones.