Not to doubt that it's politically motivated, but the ban law as written could be applied to any app with a country of origin on the US "Foreign Adversary" list AND declared to be a national security issue

You love it when the government censors people because it can? What are you even on?

Sigh. H. R. 7521 stipulates that the POTUS must make the determination using data supplied from several federal agencies etc that an app or service violates the terms laid out in the law. Then a formal investigation will be launched by the AG's office and if that investigation finds that the app or service is in violation of the law that app or service will be added to a list of apps or services not allowed to be disseminated to the public via American based app stores. That app or service does have the right to appeal the decision within a specific time frame and appeals will be handled by the appropriate district court. At that point if they win the appeal they continue to operate. If they lose the appeal they can do what is called a qualified divestiture so that they would no longer be operating in conflict with the law. Or they can do what Tik Tok did and remove access without the law even being enforced.

So, yes, Trump can just not name Tik Tok as in violation of the law, the AG won't investigate it, and nothing will come of it.

https://www.congress.gov/bill/118th-congress/house-bill/7521/text