I know that. But the aim of the bill is not to increase censorship or surveillance (of course, TikTok is already spied by the NSA, just as Google). It's above removing the Chinese shareholder.
Edit.
It's not only the NSA. Since TikTok servers are located in the U.S. for U.S. users, its data is subject to the same laws as Google and others. It means that the U.S. agencies have the same access as with Google and others.