[zorrophreak]

The new advisory warns of so-called exit bans which prohibit foreign citizens from leaving China.

So once a foreign citizen enters China, he/she Is there for good? Indefinitely?

I doubt It.

Its not so much that, its that China selectively will hold foreign citizens (this is moreos a U.S problem than anywhere else because of the deal with the Huawei exec) and make it impossible for that citizen to leave until discussion with the United States has been done. Its not any major problem, its just a huge inconvenience and some people inevitably lose their job over it.