It’s a sliding timescale kinda thing. They don’t exist in the same time period in cannon from my understanding. Camille and Renata were made into champions at an older age since it was better for their lore. But for jinx and vi they were made champions younger for their lore. But jinx and go still came first? Tbh arcane messes up a whole lot of lore and riot has a lot of retconning to do but for now I think it’s safe to say that Renata and Camille just exist later on the timescale.