Does Riot knows the op champions?!

I mean all of us guys know that there are many op champions in the game that really need some nerfs ,their damage say so,their win rate say so i will give an example for them in my opinion :-Fizz-Ahri-Syndra-veigar-Talon-Warwick-Nunu-Ivern-Anivia-Kassasin-Twitch-Miss fortune-Draven-Kogmaw,,15 champion at least you agree with me about 13 or 12 of them ,we all suffered a lot vs them in many games,so does riot really know about them ?!
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