not intended for direct human consumption
Certainly. But it's still edible. Dent corn, for instance, can be and is used for cornmeal, masa, tortillas, and so on. The industrial monoculture varieties of dent corn are optimized for animal feed, ethanol, or whatever, but nothing's stopping us from eating them (except, in theory, the ridiculous amount of herbicide and pesticide that gets dumped on them).
The reason why we're growing so much corn that's not intended for direct human consumption is because of a whole shitload of broken incentives and megacorporation subsidies and America's meat addiction and the nagging worry that if we don't keep the land in use we can't justify stealing it from the natives however many generations ago.
Which is part of what the article goes into.
And it's why the idea that ethanol opposes Big Oil is so ridiculous. Ethanol and Big Oil go hand in hand. Their interests are aligned and Trump loves them both.

As strange as it seems given the whole, you know, this, the United States is only a small part of the world.
Little Donald ordering closed coal plants to reopen like a Captain Planet villain is only going to impact a relatively small number of power plants - and those coal plants are going to close back down as soon as they're legally allowed to, for the same reason they closed in the first place, because they don't make economic sense anymore.
Meanwhile, the people buying solar because they can't trust oil and gas supplies, and the governments investing in renewables because they don't want to be held hostage the next time the United States gets a bug up its ass about Iran, will still have those solar and renewables long after Little Donald has retired to his private massage parlor in Mar-A-Lago.