It’s a fact. They do use “feed corn” for ethanol. Meaning corn used to produce food for cattle, hogs, chickens, ducks whatever. And animal feed has increased substantially because of the use of corn for ethanol. So, guess who pays for the increase?
Also, and this is a local observation, many farmers here have switched from soybeans and cotton to corn for ethanol. Guess what that does to soy products and cotton products?