Nothing is being censored. If ByteDance refuses to sell, TikTok will be removed from App Stores and have to find new web hosting. TikTok.com will still resolve fine.
What if Google says no?
Same as if Google says no to paying taxes. Law enforcement mediated by the courts.
Censorship bans the speech. If we were censoring Bytedance, we’d block TikTok.com.
This is more in the vein of “you can’t advertise your brothel at the elementary school.” You can still advertise your brothel. The distribution and amplification is just being regulated.
Free speech is a big topic. I would argue that yes, that person’s speech has been curtailed, but depending on what they were jailed for (saying something offensive versus stabbery) it could be reasonable.
Unless they were jailed for their speech, what you describe would not amount to censorship.