Oddly, in places where people say “nucyular”, they don’t say “nucyulus”. Similarly they “worsh” their clothes, but never to get out a “squorsh” stain. Language is weird. DE is correct that as a mispronunciation gains wide enough acceptance among any group, it becomes de facto correct as an alternate pronunciation.

Still though, I know a lady who says “srimp cocktail”. I will personally make sure that never makes it into the English lexicon. It is my life’s goal.