I had flagged this answer as not an answer. The flag was declined by a moderator stating this reason
declined - flags should not be used to indicate technical inaccuracies, or an altogether wrong answer.
So I thought that I might have wrongly flagged the answer, and thus moved on. But later today, I just happened to stumble upon that answer again and I see that it was deleted after all by a moderator. Why was my flag declined in that case? Is there something which I'm missing about the flags and moderator deletion?
Note - Since the answer under discussion was deleted by a moderator already, it can be seen only by users with 10k+ reputation on Stack Overflow.