This wasn’t a very big patch. I also was confused why riot called it 10.17 when it was technically 10.16b, but either way, seven champions were nerfed.
Six of them saw a drop in win rate. Evelynn and Sona being hit the hardest. Yone win rate increased slightly, but I don’t think that change is substantial enough to make any conclusions. It might be variance or might be players actually learning to play him.
Out of 5 buffed champions, all 5 saw a slight win rate increase. Kai’Sa being the clear winner, but again, the win rate increase isn’t that significant, but maybe a move in the right direction for these champions.