Also, I've not actually heard of Copycopter before, and I think it's a bit of a stretch to make the causative link between your announcement of shutting down, to also having AOL and Oink following suit. Correlation does not prove causation. (I've not actually heard of copycopter before).
I think they were trying to joke about the shutdown. I don't think thoughtbot would have been under any illusion that the events were related.