The TikTok issues have never been about the health or safety of children. If it was, it the discussion would involve other social media.
It has always been about the TikTok’s governance structure, which legally and functionally enables espionage and/or psyops against a significant portion of people who do may be involved in things that are of a US national security interest. For example, you don’t want your government personnel doing important things while carrying a device that sends important contextual data to organizations which have CCP oversight.