It reads that they can't evade or resist the effects, not that the effect can't fail to proc. It would have said "doubled chance against Jedi", which would end up being over 100% when it is upgraded anyway. It just means it won't factor in their tenacity if it does apply the effect.
"Mockery: Oh, Master, I love you, but I hate all you stand for! But I think we should go press our slimy, mucus-covered lips together in the cargo hold!"
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