I'm pretty sure you're reading this line wrong (though I don't blame you; the wording could probably be improved here). But I believe what the author is saying

I'm pretty sure you're reading this line wrong (though I don't blame you; the wording could probably be improved here). But I believe what the author is saying is "you can use these techniques in any language, but if you aren't using Haskell they might be more annoying to implement or maintain".