I think that's not what's going on here. I think it's one of two things:
1. USA has real intel on China harvesting data to Chinese servers on WeChat and TikTOk and they're filing it away for combing through for weakpoints like blackmail, potential dissidents, contacts in the USA to compromise.
2. Trump is just mad at China and it's a way to get a lot of publicity to show he's tough on them (while meekly staying hushed about Russian interference)
1. USA has real intel on China harvesting data to Chinese servers on WeChat and TikTOk and they're filing it away for combing through for weakpoints like blackmail, potential dissidents, contacts in the USA to compromise.
2. Trump is just mad at China and it's a way to get a lot of publicity to show he's tough on them (while meekly staying hushed about Russian interference)
I think both are equally likely.