I was the mod who declined this flag. I tend to set a pretty high bar for accepting NAA flags, because I don't want to slam the door in someone's face for trying to answer a question, especially when here on ServerFault, we often try to answer the question people are really asking.
Digging deeper into the context of the (large and annoyingly repetitious) answers on that question, I can see now that the flagged answer was an attempt to reply to another answer, rather than being a standalone answer on its own. It would help if you could make that clear, as per the answer on the (previously-dupe) question.
I've now fixed up the situation, by moving the flagged answer to a comment on the other answer it appears to be a response to. Sorry for the sting of a declined flag, but I don't think I can fix that. I regret my error, and will attempt to do better in the future.