I understand the argument that TikTok is credibly more exposed to demands from the CCP than American Social media. I'm not entirely convinced it's happening to an alarming degree, some collaboration with governments seem inevitable, but I'm also not unconvinced.

I don't see how that in any way leads into an argument of "If China agrees to open up its market to foreign social media, without censorship, then we can consider TikTok existing." That sounds way more like a national capitalist argument than one for national security.