Nope. If you email hn@ycombinator.com with the subject "second chance pool" and it is not your submission, there is a very high chance one of the lovely mods will take the submission and second-chance it.

Often enough, they even email the original authors and submissions about it if it is a really good submission!

Fair, didn't know that. But that proves some editing is in place, it could be a bit more active, perhaps.