By whom I'm not sure.
Our one-line intro to November 9's "Nvidia CEO faces probe over affair with alleged Chinese spy — as Rubio memo warned about her months ago" (NVDA):
Which, of course, raises the question: When did U.S. intelligence give him a defensive briefing?
The New York Times wrote in their October 29 article "Nvidia Chief, Jensen Huang, Is Seen as Target of Chinese Spy Plot":
...Mr. Huang has not received a defensive briefing, warnings sometimes given to Americans who are being targeted by foreign intelligence services, people briefed on the surveillance said....
Which raises the follow-on question: Why didn't the state security organs warn Mr. Huang about their belief that Alice Huang was a spy?
We don't know who to ask because all of the sources of the spying allegations that the New York Times quotes are unnamed.
The intelligence community couldn't have been all that concerned that the Huang-Huang pillow talk was revealing state secrets.
More to come, I am sure.
