If they really thought he had a case they would have filed in a state court for compensatory damages, but they’d never win a case like that because they couldn’t demonstrate that the loser had suffered any harm or lost any money.
The thing is that the student very likely did not realize how deficient his HS education was until required to perform basic Community College level school work. He relied on the school telling him (by graduating him) that he had met the proficiency needed to either seek decent employment or go on to college. So I don’t call him a loser. Anymore than I call any person taken in by a scam a loser.
That doesn’t mean I think he and the others have a case. His parents certainly AFAIK never were compelled to ask about the quality of his education. Nor does the reality that school is not the only source of knowledge ever seemed to have occurred to him or the others. I doubt he was totally isolated from such sources.
The truth is that government schools are broken. Government schools in large minority decayed urban cities are shattered. Giving students a way out of them would do more good than these law-suits.