Biden also announced he wasn’t enforcing the law. The TikTok operators saw the writing on the wall and realized they need to bend the knee to Trump.
Don’t get too hung up on specific dates. Laws are not some physical law like gravity that are present and universal. They exist within a fuzzy context of enforcement and interpretation.
Biden made clear he wasn’t going to enforce the law. Trump made clear he was going to make a decision based on how well Tiktok flattered and bribed him. So that’s exactly what they’ve done.
You have to be willing to walk away from and ignore corporate media platforms, or else they’ll never be defeated. And content creators need to also learn to not post their stuff to these platforms.