Almost none but no one is pretending otherwise, and it doesn't mean their academic life is a charade. They attend real classes, and they have to pass those real classes in order to stay on the football team. And though the bar is lowered for admission, most have to be at some academic level above the minimum required by the NCAA in order to even get in, because if they aren't they can't pass those very real classes. There are players who can get into other schools but wouldn't be admitted here.
You said football players, with few exceptions, aren't real students. But they are real students at Tech - no charade.
I don't see how lowering the bar for their admission makes their academic life a charade if they are taking real tests and have to pass them.
Few are on the same academic level as the average student, but they are on an academic level sufficient to complete courses and graduate.