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I'm not sure if you have any more options other than convincing him he made the wrong decision. Writing down evidence, like you did, is a first step, but ultimately he is the highest (and only) authority when it comes to closing Area 51 proposals. Sometimes, it works better if you can deliver your point of view verbally, so you could try an email him (his email is on his profile page) and see if he's in for a phone call or video chat.