i can understand your confusion: actions speak louder than words; so break it down based on what they did (not what they said) to make it make sense:
- trump tries to ban tiktok and fails
- biden, democrats & republicans try to ban tiktok and they succeed
- tiktok goes dark because it is banned
- trump promises to issue an executive order to save tiktok and follows through
- tiktok is back, but now has to depend on trump for its survival so it'll do whatever trump wants