The word ‘maize’ might be a translation error, or its use there is not the same as in America. The original may have indicated the more generic ‘corn’?
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 think you’re right... a translation error.