The SCOTUS didn’t conclude that lolicon isn’t CP. The SCOTUS concluded that certain forms of CP are legal. Furthermore, this isn’t a legal discussion, it’s a content moderation discussion, making what the SCOTUS rules irrelevant. If the SCOTUS rules that water rolls up hill, that doesn’t make it so.
So, not only does it not matter what the SCOTUS rules, but you’re incorrect on what the SCOTUS did rule.