I disagree.
If you have the chance to be a major baseball prospect instead of a football prospect, the math at the top end always favors baseball. In both longevity, and amount, he would absolutely make more money in baseball. He knows it, his family knows it, Vitello knows it, Heupel knows it as well.
If he can become a top football prospect like a Russel Wilson, or Patrick Mahomes, then the money left on the table doesn't matter as much. It's about going where your heart is at that point.
Unfortunately, being a WR and becoming a top end prospect is extremely hard in football. If I'm Amari I'm second guessing myself every night, and then you have some guy that won 6 NC tell you that you are priority #1 for him because he believes he can make your dreams come true.
What fans think doesn't matter, what matters is this might be the worst decision he's ever made and he needs to hedge his bets as much as possible.