It referenced teosinte so, while corn/maize probably did not actually derive from teosinte, Teosinte is found only in Central America and is the acceptable precursor for corn/maize because nothing else has been found. So the finders believe that the maize in derives from Central Americ.
I did not see teosinte referenced in the linked article.
Corn being grown in Asia during pre-Columbian times would seem to be a really big discovery.