I can't see his/her profile. Did he/she submitted the answer and deleted immediately the profile?
No, Rahul's account was destroyed because Rahul is a spammer. This deletes all their "content".
It was a spam answer from an unregistered account so neither we nor they have lost anything of value.
If they want to contribute useful answers then they can create a new account and try again.
It's worth noting that in all the months I've been destroying spammers on sight not one has come back to complain that their account got deleted.