About Yasuo and Taliyah

I'm not sure what rito is doing with its lore, does the League of.... Justice..?, just, does the league even exist anymore? I'm pretty sure old lore was champions are people/things summoners use to fight out differences/problems, and that the champions are given power / something in exchange for the summoners using them, but according to sona (since we can hear her thoughts), and some thing I read about ez a long time ago talking about how it feels weird being in a mirror matchup with himself (idk if its official), its logical to think that the champions still have some form of knowledge of the fighting they are doing. SOOOO... wouldn't Yas kn that Azir is alive and stuff since hes fought him? (Also that he's "good"ish, according to most people)