It's worth noting that personalisation isn't moderation, An app like TikTok needs both.

Personalisation simply matches users with the content the algorithm thinks they want to see. Moderation (which is typically also an algorithm) tries to remove harmful content from the platform altogether.

The ruling isn't saying that Section 230 doesn't apply because TikTok moderated. It's saying Section 230 doesn't apply because TikTok personalised, allegedly knew about the harmful content and allegedly didn't take enough action to moderate this harmful content.