He is full of BS!

I sold to him one of my spare accounts. He entered the account, link it to his own email and said he didn't know anything. The account was previously linked to my own email but delinking is easy enough, so that's what he did and link it to his own email. Afterwards, he refused to accept that he has changed the password. I had to contact the devs for support in this matter. Since I was inexperienced as this is the first time I sold my account, I easily trusted him. Please don't make the same mistake. You can trade with him but never let him go first.