Zhang Yiming, ByteDance's owner, is a Chinese citizen who lives in Beijing. The real problem is the latter part, in that PRC can do whatever physical enforcement on him. While I don't doubt his intention to keep TikTok separate from international politics as far as possible, but I am 100% sure that if CCP doesn't like Zhang's "lack of patriotism", it will teach him a lesson even if it's a unlawful way. They did it to Jack Ma, so the same thing can happen to Zhang.