If it was intended as criticism, then one would expect the joke's author, who was the regulator in charge of ensuring no racial discrimination, would have offered the much more direct criticism of taking regulatory action.

The joke's author did no such thing. And was careful to make sure it never got to anyone who might be inclined to criticize Harvard's admissions practice.

Furthermore the fact that Harvard admissions HAD slang like "Just another AA CJer" is pretty strong evidence of discrimination.