I notice that the
Reversal badge has been awarded just a single time, to @Macallan in 2015. I was rather sad to see that for something this rare - an answer apparently that good to a question apparently that terrible - that the question was subsequently deleted.
But this question from @Glen_b says "It looks like OPs can only delete a question with an answer if there's only one answer and the answer isn't upvoted".
Does this mean that the question was deleted by mods? Is it okay to ask what happened there? And what pearls of wisdom I missed out on because that answer of >+20 was deleted?