Barry

To quote your article's first paragraph:
"Postmillenialism is incompatible with theonomy. Theonomy is not a doctrine or a belief; it is, in short, thinking that is governed by the word of the Christian God or, in long version, that Gods word is the sole, supreme, unchallengeable standard for the actions and attitudes of all mankind, whereas postmillenialism is an eschatological (end times) doctrine. This is not what makes them incompatible; this is just something that makes them different types of things."

How is Theonomy not a doctrine or a belief? It seems to me that your description of what Theonomy is a doctrine itself. The question to me is whether it is biblical or not.
All true Christians are Theonomists in what I would call the narrow sense of the word. Meaning that if Christ is Lord of their lives, they are putting off their old selves and putting on Christ as they learn from Scripture to put it in into practice.
I am reminded of Psalm 1:1-3.
1 Blessed is the man
Who walks not in the counsel of the ungodly,
Nor stands in the path of sinners,
Nor sits in the seat of the scornful;
2 But his delight is in the law of the LORD,
And in His law he meditates day and night.
3 He shall be like a tree
Planted by the rivers of water,
That brings forth its fruit in its season,
Whose leaf also shall not wither;
And whatever he does shall prosper.

Tom