Moxie suggested that I acquire a certificate for a similar domain to meet that requirement but that doesn't meet either the normal definition of valid (If a show requires a valid ticket to be shown at the entrance, will one from last night do?). He did claim that producing a forged certificate is possible and I have no reason to doubt him. However, he noted that he nor anyone else would produce one for a reward of this amount.
We were still corresponding when he made the tweet in question. I ultimately asked him if he believed that a certificate to another domain was a valid certificate and his reply didn't address that point but discussed instead why he and tptacek are frustrated by these kind of contests.
I'm sorry I seem to have offended you.