Actually, Antoine Jr. -- or any other college football player -- would qualify for a medical redshirt, if he played in no more than 4 games, all in the first half of the season... and if a doctor signed off on his injury, which would be absolutely NO PROBLEM for Antoine, or anyone else in a similar situation.
But I am in agreement with the earlier poster... if Antoine could be ready for just the Wisconsin game, then I think he would do anything to get on the field, while tossing aside the notion of a medical redshirt.
Lastly, from what I saw of Antoine last year.... if he plays football for Minnesota in 2020, it will be as a Viking... not as a Gopher.