Assuming the results of this experiment are as true for a good random sample of "conspiracy theorists" as who they actually tested it on, I wonder how the results of the experiment among "not conspiracy theorists" would differ. Considering that
other studies have shown that conspiracy theorists act saner than those who believe official theories, my guess is not much.
After all, there have been many instances where satire has been passed off as genuine and elicited a lot of waste of cognitive resources among conspiracists and non-conspiracists alike. The fact that most who liked it were conspiracy theorists is likely a reflection that most of those that read about and look for information about chemtrails, troll or genuine, are conspiracy theorists. If you put out troll information about oil pipelines being linked to cancer and poisoning or Tea Party members scoring higher on psychopath tests the audience that liked and shared it would be composed of very different people.
There is also the possibility that has previously been raised that those that liked it saw right through it and wanted to share a good laugh.