(4) FOREIGN ADVERSARY COUNTRY.—The term “foreign adversary country” means a country specified in section 4872(d)(2) of title 10, United States Code.
10 USC 4872(d)(2) [2]:
(2) Covered nation.—The term “covered nation” means—
(A) the Democratic People’s Republic of North Korea;
(B) the People’s Republic of China;
(C) the Russian Federation; and
(D) the Islamic Republic of Iran.
in other words—the law is and will continue to be express about which "foreign adversary countries" cannot operate and/or control ByteDance.
[1] https://www.congress.gov/bill/118th-congress/house-bill/815/...
[2] https://www.law.cornell.edu/uscode/text/10/4872