How come no one including the parents of the suicide victim don't know the cause of death if the reason was apart from academics?

Recently came across Rahul Lavari's death from IIT Patna where all the websites claim that he was academically excelling and was happy all the time and even attended Kumba Mela but we don't know what happened all of a sudden.

He literally sent a message in WhatsApp group that he is a loser and then proceeded to slit his wrist and then jumped from 7th floor. I am surprised no one knows the reason for such a huge step taken by him which seems like pretty planned.

I have never heard any news where people cut their wrist and also jump from the building. I have only heard of cases where people either choose do the former or the latter but not both. Quite heartbreaking. Rest in peace, buddy!