If you turn it on, you'll see all the submissions and comments that have been killed by the editors. They're mostly spam and duplicates.
Which is not at all a way to delete your own account, and proof that even spam and duplicate accounts are not actually deleted.
I think that's what he's saying. There's a deleted post above him. I think the comment you're replying to is saying the same thing you are.
I don't see how doing that deletes your account or your data for that matter. From what I understand it just shows you content that was 'supposedly' deleted but in fact it was just hidden.
Ah the comment I was replying to was deleted :-/. The comment suggested to use 'showdead', that's what I claimed to be false..