Sure, but by that same argument, this executive order bans ByteDance/Tencent under American laws and directives (specifically, the International Emergency Economic Powers Act).
Obviously not the case - this is an out-right ban. There has been no evidence of TikTok violating any laws, and furthermore, no new laws have been issued to which TikTok could adhere to avoid a ban.
Companies operating in China can adhere to Chinese law to operate in the country, but the Trump administration hasn't even issued any laws.
This is unprecedented.
One of those laws is China's National Intelligence law which requires all companies to cooperate with and aid national intelligence.
https://fortune.com/2014/08/11/china-western-companies-monop... (China vs. Western companies: Best defense is a strong offense)
https://www.cnbc.com/2019/02/28/1-in-5-companies-say-china-s... (1 in 5 corporations say China has stolen their IP within the last year: CNBC CFO survey)
https://money.cnn.com/2018/04/05/news/economy/china-foreign-... (How China gets what it wants from American companies)
https://money.cnn.com/2018/03/23/technology/china-us-trump-t... (How much has the US lost from China’s IP theft?)
When you learn a bit more about geopolitics, you realize that there's more to these things than initially appears. Tiananmen Square was pretty bad. But when you look at the utter collapse of Russia after it tried to Westernize, and the poor shape of America because of her own economic policies, someone not living in the Anglo/American news bubble would really have to wonder.
To that end, companies that have an easier time skirting around the dirty politics – like Tesla, Ford, and GM – have been able to have successful and profitable operations in China. As the parent points out, there's a pandora's box that's being opened. And if you are led to believe that it's a normal comment, it's the same nationalistic stuff you've being trained to fall in line with.