That's an excellent question.
The risks I mentioned earlier in one of my responses apply especially to members of Parliament, who may find themselves of interest to the Chinese government as a target of their influence. If your data is on TikTok and China avails itself of that data, it may seek to understand more about you, more about your personal networks and more about the ecosystem that you work in to be able to target foreign interference, espionage, cyber-attacks or other things toward you.
Obviously, as members of Parliament, you have a particular access to and influence with the government that most people don't enjoy, and I can imagine why you would be a particularly interesting target for the Government of China.