Yes, that's a good question and I can't answer it either. Perhaps the person originally did not want to put the money into the account and later changed their mind.

However, there were also times when you could lose your bank account if the bank could see that the money came from selling cryptocurrency. There were a lot of cases like that, even if that hardly ever happens nowadays. Maybe the seller wanted to cover this up. That would actually be the most plausible explanation for this, because the case was two or three years ago.