He never says Scripture alone or Tradition alone.Blessed Augustine relied on Scripture,Sacred Tradition and the Magesterium of the Catholic Church, Just like we Catholics do today.
Go back and read post 10,817 http://www.freerepublic.com/focus/f-religion/1870079/posts?page=10817#10817
Look at the full picture. All of it, and not part of it.
I wish you a Blessed Evening
Whatever you hear from them [the Scriptures], let that be well received by you. Whatever is without them refuse, lest you wander in a cloud. (De Pastore, 11)
This Mediator [Jesus Christ], having spoken what He judged sufficient first by the prophets, then by His own lips, and afterwards by the apostles, has besides produced the Scripture which is called canonical, which has paramount authority, and to which we yield assent in all matters of which we ought not to be ignorant, and yet cannot know of ourselves. City of God, book XI, Chapter 3
It would be well for you to rely less on the cherrypicking Apologist Sites and more on the entire writings of Augustine concerning the primacy of Scripture.
"...relied on Scripture,Sacred Tradition and the Magesterium of the Catholic Church, Just like we Catholics do today."
Please reference Scripture which supports the Bodily Assumption Of Mary.