If he is lucky maybe he can recover lost files, but the reality is not.Be patient, because those who commit crimes will inevitably get into trouble in their lives, and you must learn what you have lost, to be more careful and learn.
It can be recovered if he only deletes his own files on his own device because nowadays there are now application or software that is specifically designed to recover deleted files .
Now if your wallet or private keys have been hacked , it is another story anymore . you cant recover hacked files from a hacker because they can easily close their accounts online or they will only use dummy and fake accounts in order to scam inoscent individuals .