2

I believe this question was closed as a dup (I voted to close it).

Who reopened it? Why?

4

It was never closed. Clicking the "timeline" link on the question shows its entire status history: this is available to all users regardless of rep.

Here is the timeline of the question you linked: nowhere in the history does it show closure. For reference, here is the timeline of a question that actually was closed. Specifically you're looking for changes to the "state" of the question, like this:

timeline screenshot

Your linked question has no such state changes in its timeline.

Also, simply voting to close does not appear on the timeline (or history) - only actual status changes that are completed (by community vote or mod vote, for example). I believe closure votes expire after a time if closure is not completed, though I'm not 100% sure of exactly how much time must pass.

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