Yes, the patients were mostly older (IQR 45 - 53), but the damage stats are enough to give anyone pause. When 78% of the subjects showed heart damage, especially when contrasted with the controls, you just about have to sit up and take notice. The usual assumption would be that anybody coming down with the disease, even if they were likely to recover, would be at severe risk for lasting heart damage. There's no reason to assume that young people would be exempt, unless they had very mild cases. And, btw, in this context, nobody knows what a "mild case" actually is.
I have no doubt that the commissioners were told that possible legal liabilities were looming from playing football. I'm pretty sure that the SEC,ACC, and Big-12 people were told the same thing. That's why they are waiting for a month or so to see if the dust settles. (Hint: it won't.) I continue to doubt that a football season is on tap for this year; even if it starts, it will almost certainly stop soon enough.
A side note: my wife has a client who is an inveterate opponent of mask wearing and spread this to his whole family. His daughter goes to Bammer. She lasted a week; both she and her also non-mask wearing roomie came down with the virus and went home. And - you guessed it - all but one member of both families, including children of all ages, now have the disease. This thing has an attack rate you would not believe, at least for those who won't take it seriously.