Linking a few of your own tweets to youtube videos is not very enlightening. Do you have an actual sourced article stating that the CCP is illegally accessing user data?
Sorry, I misread the original question. I am not aware of the CCP accessing TikTok user data (for instance, to track dissidents or surreptitiously use it to compute social credit scores).
All Chinese companies have CCP organs within them that the CPP uses to ensure the company adheres to party policy.
They are using the internet and all it's operating entities as a massive surveillance and enforcement machine.
Try posting a TikTok critical of China, or saying something about HK and see what happens.
The data from Chinese apps can be accessed by Xi & Co. whenever, for whatever purposes, including finding out who your friends are so they can be sanctioned/imprisoned as well.
Now - TikTok USA division - that's another story and it's hard to tell how far enforcement goes. Definitely it's censored and definitely there are elements of propaganda (you can tell from the content) but it's not hugely obvious. As far as data mining, I don't have specific information but I don't see any reason why they wouldn't have access to it just like WeChat.
FYI This is why WeChat is 100% banned and there's no option for them while TikTok has an option to cut off from the parent company.