question about buying jagex account

[Pink Dolphin]

I'm looking to buy a quest cape account, possibly from Lucky Charm Gold. I'm not too worried about their rep since they have good long term reviews, but I do have a question about Jagex accounts.

I've never had a Jagex account before, and I'd prefer to buy from a seller who can provide access to the original email used to create the account.

Their listings state:

"This is an originally created Jagex Launcher account. There is no recovery process for these account types. Once we change the email of this Jagex Launcher account to yours, the account becomes unrecoverable. Even by us."

My question is, wouldn't they have needed an email to create the account in the first place? If they don't provide access to that original email, wouldn't that still be a potential risk down the road?

I'm just trying to understand how Jagex accounts work and whether changing the email to mine actually prevents the original owner from ever recovering the account.