From http://bunpro.jp/grammar_points/ない-はない :
(emphasis added)
～ない～はない is an example of a double negative in Japanese, and is a grammar construction that requires careful attention in order not to incorrectly interpret.
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Well I don’t think that isn’t a great way to put it
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TIL Japanese also has litotes!
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Cool, TIL about litotes (as a named concept), period.
I just asked a related question to a supposedly intelligent robot, who answered that litotes exist in most, possibly all languages. Which seems believable.