Audits are completely automated. They'll pick "known" good or bad posts (based on previous actions) and test you. There are also some random insertion tests in the suggested edit queue.
This was one of the known good posts, to catch people who are trigger happy with closure.
I think this is one of those rare injustices the audit system occasionally springs. I think you were also caught out by the wording of the update. Even with the workaround, there remains a question that warrants answering (Why the hell am I seeing penises when I search for gedit?)
There's nothing I can do to remedy you having fallen into this one, but we can work on improving the question to make sure future reviewers don't have the same problem.
I'll edit it up but contribute if you feel you'd still vote to close it.
And just a reminder: the odd failed audit isn't the end of the world. There are much trickier ones than this and I think all the mods have at least a few failed audits on record. The system only takes notice if you fail many within a period of time.