It is from his open-advocacy-of-theonomy phase (pub. 1989). ICE/GaryNorth is the publisher. Proceed cautiously.
From the link in your post, how do "sacrifices and laws of uncleanness in Leviticus, for instance, form an extended commentary on the creation and fall of man?" Did Moses mean to do that? Was Moses writing as directed and thinking he was writing one thing, but God was composing polyvalent literature? Should the Bible be read forward, or backward, or backward and forward at once?
Jordan taught (teaches?) a hermeneutical technique some have called interpretive maximalism. In short: if he thinks it up, provided he sticks to some form of rational procedure that seems to yield a set of coherent (to the interpreter) conclusions; then the HolySpirit must've put it in the text to be found. There are untold levels of meaning to a biblical text (because God is infinite and the Author).
It is quite possible there are some interesting insights Jordan gleans from the text. Such is the case of most thinkers with "fruitful" minds. I would be wary, however, of tenuous claims (in regards to understanding the meaning and purpose of the text) that largely bypass a passage or a book's clear intent, in favor of a form of meta-analysis with a tendency toward gnostic-flavoring. "Let JJ be your guide."
If you read him with the attitude that means to try to separate wheat from chaff, there may be a little profit to gain. If you read with the hope to be enlightened by a guru, you may be dazzled; and most who are, are also not able to reproduce similar clever and arcane effects in their private study.
I'm confident the biblical authors, starting with Moses himself, always wrote with previous revelation haunting their imagination. I know (as Peter tells us) they wrote more than they knew under divine inspiration. They were writing the story of Christ-expectancy, while they were directing their words for immediate concerns. Hopefully, what you get from JJ's book points you more to Christ (out of Lev. and Deut.) than to creation, fall, and ethics.