He put US national security at risk just because between his wife and his other mistress, he couldn't keep it in his pants.
There are some things more important than stock valuation.
Given that the economic growth of the USA during the last few years was entirely due to this man and his technologies, I'm going to say nah.
China having access to GPUs is not a national security threat. It's an economic threat. Not sure why people treat China as some enemy nation. It's just a competitor.
It is far far worse than that - he lied to shareholders.
Or maybe he just simply wanted to make more money by increasing demand for Nvidia's GPUs by tacitly allowing for them to be exported to China though Singapore.