This was nice of them. It didn't bother us too much. We were indignant the first time someone copied our application form, but at least these guys admitted it.
Additionally, the obsolete question(s) on their application (no longer present on YC applications) were not their fault. A bug has been filed with y2combinator: http://y2combinator.com/
It kind of reminds me of a salary history where a company wants to pay you according to how other companies value you, instead of making their own determination.
It's like they don't know what to ask, so they went with what you came up with. Well, if they can't figure out what information they need on their own, how are they going to figure out who to invest in on their own?