My friend got rejected

My friend just got rejected today after receiving his admissions even though he’s got amazing high school stats (extracurriculars, 4.3 gpa, 34 act). He applied for computer science and I just wanted to see if he can get some sort of second review or appeal on his college admission. He’s currently emailing the admissions office about it and just wanted to know if it’s about the recent R1 status, overpopulation in general for the school, or anything else.