E-mail changes can only be done by the global admins on special occasions. So no, it's unlikely he can "change the email the account is linked to" because it rarely, if at all, will happen.
Lol, I mentioned that because it was so easy and fast to change my account's e-mail back in 2016, I don't know how things are going nowdays. I just rememeber sending both an e-mail and a ticket to toonslab and they changed it in the same day.