No, I would say it is American-centrism on display on your part.
In Europe, the term "corn" means ANY cereal grain. Not the sweet yellow stuff that the word means in the USA. They call that "maize". Their use of the term corn long pre-dates the "discovery" of the yellow stuff by Europeans, so it was in use during the Middle Ages.
So, in the dark ages in Europe, "corn" would have been any grain, such as barley, oats or rye, all of which were the most common foods in Europe during that period.
The article and the author, were almost certainly correct.
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