Under what authority? A dozen paragraphs in the article and not one questioning whether he can actually do this. What would such an executive action look like? An EO to Apple and Google to de-list the app from their stores? Why should they comply? What's he going to do when ByteDance uploads the .apk somewhere? Sick of media treating this man like a zoo exhibit instead of the advanced persistent threat to US democrac…
Under the Bernstein v. United States ruling software source code is protected under the 1st amendment, I do not know if this holds true for binaries as well though. I guess if TikTok distributed only its source code and it was compiled by the user the gov would be able to do nothing about it.
One could not inspect the data flow after it left the client, but it would still show far more than we normally see from major social-media vendors.