I mean I think many things about Nvidia but one thing I do not think is that its CEO is an idiot.
I also think he will have had security advice that she might be, not least because Trump and Rubio knew a year ago.
Here is an easy guide to working out if someone could be a spy: if they are foreign, keen to get to know you, and they run a large enterprise that would be materially advantaged by having a way around the export controls on your products that impact the state where they were born and where they do business, they could be a spy.