I middlemanned this trade. At the time of trade, I informed rs91 that the email linked to the account was not created yet, and he should create the email himself to keep it secure
At the time of the trade, I linked a screenshot below showing the email was creatable. Going back right now it shows that it is currently not available, so someone somewhere did create this email.
I believe if the buyer did not make the email when I advised him to, someone may have been given or found out the email (lets say if he paid for a service or something) and noticed it did not exist and created it themselves to attempt to recover the account. If not, the buyer should be able to use that email to recover the account back I believe without a problem.
Email status then and now