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Regional and wider exchange networks had existed in that region for several thousand years before millet is now believed to have been cultivated. The transformational nature of this discovery has more to do with our understanding of farming practices. As stated in the article, this site precedes the earliest known site where millet was presumably cultivated in that region by 500-1000 years.

If you read the publication linked there is a lot of textual evidence for millet production that goes back into the 3rd millenium B.C.E. The transformation here has largely to do with new methods of discovering what crops were grown where, and a shift in our understanding.