Blade Passive and dimensional beings immunities

I do not understand the description on Blade's passive.
It says "When against dimensional beings, Danger sense activates and grants Blade x attack rating while also reducing the opponent's ability accuracy by 40%. This ability accuracy reduction ignores dimensional beings' immunities"
So, what I interpret of this is, the ability reduction ignores whatever immunities the champion has... against ability accuracy reduction (like Archangel, if he were a dimensional being). It certainly does not shut dowm immunities (poison, bleed, incinerate).
So what is it supposed to actually mean and which champion is this intended for?
It says "When against dimensional beings, Danger sense activates and grants Blade x attack rating while also reducing the opponent's ability accuracy by 40%. This ability accuracy reduction ignores dimensional beings' immunities"
So, what I interpret of this is, the ability reduction ignores whatever immunities the champion has... against ability accuracy reduction (like Archangel, if he were a dimensional being). It certainly does not shut dowm immunities (poison, bleed, incinerate).
So what is it supposed to actually mean and which champion is this intended for?
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Comments
If I extend his danger sense to all mystics it will still only affect dimensional beings?