Why would they when it validates their internet strategy? It just shows the CCP was 10 years ahead of the US when it comes to restricting what apps citizens can use (to "protect" them ofcourse).
If China benefits from TikTok then it's a fair question to ask if they are working to stop the ban of TikTok.
What benefits China more: tiktok, or turning US into oppressive state that jails people for accessing internet wrongly?
You're thinking short term. If the US bans tiktok, more countries will follow and american tech companies will have a hard time competing there. On these grounds chinese companies will be able to compete better because they're already used to running multiple versions of the same app targeted at different markets.