This question of mine was closed on SO by two users for "being off-topic".
According to the FAQ on closing questions it takes five people to do so, not merely two. Furthermore, I have flagged the question and asked for an explanation, but have not received any.
None of these other questions have been closed although they are similar in scope -- the first one and second one are almost a duplicate, the third one offers an interesting response. All of these questions are "how-to" questions and are hardware-related. Hardware questions are typically not considered off-topic, otherwise there wouldn't be thousands of them, see e.g. this search result.
Question: How is it possible that the question was closed by only two people? Was this decision justified?