This is a whole bunch of BS. These Chinese employees are already working internally in Ai and cloud division having access to their IP and can easily 'steal' it so they don't have to be out of their country to do it.
My point was about coercion by the State. For a Chinese employee who's sitting in China, there's not the same interaction with the State as if you're going through customs.
Second, even these Chinese employees leaves China to the west, these employees will be seen as a 'threat' to other employees in Microsoft and won't get the upward mobility compared to employees in the west.
I never worked at Microsoft, but as long as someone has excellent spoken and written English, I doubt they will face undue impediments in their corporate advancement.
The language aspect is a big one. My advice to anyone intent on corporate advancement in a foreign country would be total cultural immersion. These days, you can live in another country but still consume all news & media in your native language, surround yourself with other ex-pats, and have very few points of contact with the culture of your host country.
I used to work with a guy who, as far as I could tell, only used English outside the workplace when he had to deal with school & healthcare for his kids. Another one of my former co-workers came to the US at about the same age (i.e. for grad school), but seemed almost more American than many people who've lived their whole lives here and I honestly don't think that was an act or driven by any sort of insecurity. He sincerely gravitated towards US culture as a kid and we shared many of the same interests and cultural reference points. I'm pretty sure his primary and secondary schooling was all in his native language (I mention this, because I believe some of the more elite schools in India use English as the primary language).
Besides, these Chinese employees will probably get an H1B visa like visa and will get paid much less compared to their western counterparts.
The H1B program forbids employers from paying recipients less, precisely as a disincentive to abuse the program for this purpose. Furthermore, they're required to publicly post details about the positions filled by these visa holders, so other employees can actually see there's no pay differential. In several cases, I've seen these postings where they made bigger salaries than I was receiving!