Nothing would happen to Mr. Huang, he's free to talk to anyone.

He wouldn't be meeting Xi, as it's not a state visit, but he did meet the Vice Premier, He Lifeng. Elon also met Li Qiang.

Imagine if Jensen Huang started meeting Xi Jinping to seek help for carrying out political change in the US.

What then?

No need, he has already convinced Trump to sell chips to China unabated. Why meet at this point?