why does olaf's R not cleanse nearsight?

why doesnt it prevent, or cleanse them. im really curious as to how not being able to see isnt a disable. tooltips should accurately represent what the ability does, not give us a general idea of it. if the ability states removes all disable's then it should indisputably remove all disables. please help me figure out if this is just a bug or if riot needs to change alot of tooltips.
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