The reason is the T.U.L.I.P. garden thinks Augustine is a Crypto-Calvinist
BTW-Both Dion and Kolo have state this to be "Western" thinking as opposed to "Eastern" thinking. From as much research as I have so far done on this I would say the Reformed view is neither western nor eastern thinking but it is historical theocratic thinking coming from the Old Testament Jews. They always held that God was fully in control of their lives (see 1 Sam 3, Esther 6, Dan 4 or Job 42 for examples on this.)
All other thinking whether they be "western" or "eastern" thinking is Greek thinking, anthropocentric in nature, stemming from Greek philosophy. Man's free will is "Greek" philosophy and has no root in the Jewish theocentric thought process. It should be noted John Cassian was heavily into Greek philosophy. There may be subtle differences between western and eastern Greek philosophy which I have not yet traced down; however it is essentially built from the same foundation of man's will. The Reformed view is not based upon Greek philosophy; western or eastern.
From the Greek anthropocentric philosophy original sin and man's depravity is a falacy. But from a historical Jewish theocentric view original sin and man's depravity is fully recognized. Thus man cannot be "evil" for the Greek view but man is "evil" from the historical Jewish view.
Augustine was no "Crypto-Calvinist". Rather, Augustine was a Proto-Calvinist -- that is, he correctly maintained the Orthodox Doctrine of the Christian Church long before it was utterly corrupted by the Papal Supremacists of Rome.
As I have previously said:
AT THE END OF THE DAY, it is the heretical Roman Catholic Papal Supremacists who are attempting a False Anti-Protestant Alliance with the Eastern Orthodox; Never mind the fact that important Patriarchal Confessions within Eastern Orthodoxy have acknowledged hard-core Augustinian Theology as being acceptable to the Orthodox, whereas NO Orthodox nor Protestant has ever accepted the foundationally-Romanistic Dogma of Papal Supremacy and Infallibility.
Whatever our disagreements (and here, we Magisterial Protestants are willing to appeal to Orthodox Patristics and Orthodox Patriarchs and Orthodox Tradition in defense of our Theology), we Calvinists and Orthodox do at least agree upon the God-Ordained Organization of the Church: the Conciliar Form of Church Government.
Whether an Orthodox Council presided over by an Ecumenical Patriarch, or a Presbyterian Assembly presided over by a General Moderator, at least the Orthodox and the Calvinist Churches have the Biblical Modesty to Obey the Biblical Form of Government for the Church:
Against this Biblical Model is contrasted the Satanic Organization of the Church of Rome:
LUKE 4:5-7
And the Devil, taking him up into an high mountain, shewed unto him all the kingdoms of the world in a moment of time. And the devil said unto him, All this power will I give thee, and the glory of them: for that is delivered unto me; and to whomsoever I will I give it. If thou therefore wilt worship me, all shall be thine.
Satan offered Jesus absolute, Totalitarian Power.
Jesus chose instead to establish a Conciliar Church.
Apparently, the Pope of Rome didn't like the deal, and decided instead that the whole "Absolute Power" thing sounded pretty cool.
Sorry, Rome.... while I may have my disagreements with the Eastern Orthodox as to their particular Theology (and not even so much disagreement at all, if Cyril Lukaris is my Ecumenical Patriarch), I think I'll tell the Papal Supremacists "Get thee behind me, Satan", and stick to the Conciliar Form of Church Government established by the Apostles and Jesus Christ.
Best, OP