Essentially, that is a possibility. However it is no more likely then if the old recovery system was still around.
If you're going to buy an account the only thing you can do is use an OMM and have him provide a recovery test so you know you have a fighting chance at recovering it as well.
Edit: I've changed the top portion to the guide to the only and current way of getting an email removed from an account, however, I am leaving the bottom bit just incase Jagex reverts to the old system, which I believe they will because at the moment they have to hand delete every email themselves and we all know Jagex doesn't have that type of patience.