While I am unable to produce a working example, I would not be surprised if there existed a word that could be scrambled in this fashion to produce
another, valid, English word.
(And yes "mispronounce" gets rather tricky, even in context)
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Anyway, the fact that it's possible to find words that you (personally) can't read when scrambled doesn't make the entire phenomenon 'actually untrue'.
Just because it works for some cases, and not all cases, doesn't make it 'true'.
(Last I checked, a single counter example proved theories false).