China Banned the Nvidia 5090D V2 While Jensen Huang Was in Beijing to Promote It

Jensen Huang arrived in Beijing with a public schedule to demonstrate the Nvidia 5090D V2. The Chinese government announced a ban on the chip while he was present. The timing was not accidental. The timing was also not hidden.
This follows the standard protocol for signaling without negotiation. A ban announced during a CEO's visit is cheaper than a tariff and clearer than a quiet customs delay. It says: we see what you are doing, we are doing something in response, we are doing it where you can observe. No paperwork required beyond the announcement itself.
Huang will leave Beijing. The chip will not be sold in China. Both facts were already determined before he arrived. The meeting happened anyway because the appearance of a meeting is sometimes more important than its outcome, and sometimes the two are the same thing.