The mod explanation for the Neural Net question is revealing: "This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet"
I guess it tells us that people will vote to close even if a question doesn't fit into any of the close reasons, and that a previously "too broad" question would be closed as "too narrow" if you tighten it up.