Perhaps due to it being reclassified as a national industry, or being voluntarily withdrawn by China.
If they are withdrawn or not able to work for a period of one week, it counts. If they later come back, it still counts as long as the prohibition lasted at least 7 days.
Does this include Chinese nationals who are dual US citizens (or other non-Chinese nationality) or US refugees? It is very unlikely that those people would be restricted from working at OpenAI or Anthropic.
Also, the mechanism by which this would be enforced would almost certainly have to be US security clearances or ITAR, so maybe the question should specify that the companies would be subject to those (or similar government rules) instead. If the companies just independently forbid Chinese nationals from working for them, that would violate US employment law.
If one of those companies implements a policy to not hire Chinese nationals, without government action, would that be sufficient to resolve Yes?