This isn't really news, many countries collect data on their own citizens in expanding ways.
https://www.theatlantic.com/international/archive/2013/06/ac...
TikTok almost certainly receives requests from various governments to collect data no differently from Facebook/Google/Verizon etc..
I think it's not a question of if China is doing this as well; certainly they are. No politician is going to publicly say though, "Look we know China is collecting data on you from TikTok because, uh duh, that's what we do with all of your US based social media posts."
I also don't think our government is all that directly concerned that China is monitoring. I think the concern is more on how the data and the outside control of the platform might be used to influence public opinions. Election tampering and the like.