First off, I don't really care whether you're hurt or not, because I wasn't attacking you or you rank, simply stating a fact.
Second, Yasuo is a high skill cap champion that, when played well, has the ability to outplay many champions and can carry his team. By the looks of the site you used, this is for platinum+ ranked games. Assuming the info is accurate, then it would make sense given the fact that people who master him do well. This doesn't mean he's overpowered, it's simply the way that he is built.
As for your site, it shows Yasuo having a good win rate. Another reason for this, aside from the fact it is only platinum+, is that you looked only at Yasuo top lane, but he is also a mid laner. And if you do look at his win rate and such in mid lane, it is significantly lower. Not to say Yasuo is weak, because he definitely is not, but he is not as strong as you say he is. As a whole, he's a balanced champion.
Put simply: in this current patch, with the current priority top laners, along with the items (basically, in the very current meta in top lane), he has a high win rate among skilled Yasuo players. But, his win rate including both mid and top is not as high. Yasuo is strong, not overpowered. And please, don't quickly disregard this because you personally think Yasuo is overpowered, try and actually look at the champion and perhaps learn his very efficient counterplay.