Deuteronomy is the last book of the Pentateuch (i.e. The Five Books of Moses or the Torah). It has always been considered a unique creation, separate from the other books of the Pentateuch by its distinctive literary style and structure. Some traditional biblical commentaries implicitly acknowledged those differences when they claimed that Moses, and not God, authored the book.
The prevailing scholarly theories, (notably those based on what is called the Documentary Hypothesis) date the creation of Deuteronomy to the period of King Josiah, circa 620 BCE. This is based on the narrative in II Kings 22-23 which tells of a long-lost scroll being discovered in the temple, with the traits of Deuteronomy. Scholars assumed it was written at that time, and the court of Josiah placed it into the mouth of Moses to give it sanctity.
The events at Ebal, which are described in the Bible in Deuteronomy 27, correspond virtually perfectly to the finds in the site of the excavation that was headed by Professor Adam Zertal. Further, some of the details that correspond, could not realistically have been written by someone unless they were present at the time of the events in Ebal. (The details are discussed by the Author in the book.)
This led the author to conclude that the biblical text about Ebal must have been written circa 1200 BCE, when the site was active…600 years earlier than the current scholarly view. Scholars agree that Deuteronomy is a fairly uniform text, meaning that the balance of Deuteronomy can also be dated very early. And since the dating of Deuteronomy to the time of Josiah is the linchpin of scholarly dating of the entire Pentateuch, showing this dating to be flawed has enormous scholarly consequences.
The author’s conclusions might be considered random musings, if not for the fact that his ideas have been quoted in public lectures by a number of eminent scholars of Judaica in Israel for the past few years.