3) The fact that he slept with a Chinese spy is a huge deal.

She's alleged to have been an 'intelligence asset', which is not the same thing as a spy (assets are not agents). Assets are often just good sources of insight and analysis, whereas agents are tasked with active deception and exfiltration of information. Jensen Huang is arguably an intelligence asset; I'm sure he's given informative briefings to spooks on the state of the world, albeit not necessarily knowingly.

A related question to this is whether Jensen Huang even has a US government security clearance.It's not obvious to me that he's privy to any government secrets, even if the US regards Nvidia as a strategic asset. To pick up on your point 4, he might have been knowingly violating the law, a problem for any CEO. But if he's not definitely violating sanctions and is instead just chasing profits, that's considered the norm.

To be frank I think this is a storm in teapot because there have been rumors about his affair floating around since last May, and if the US government has known for at least that long and hasn't intervened or arrested him it's probably not that big of a deal. I can't help wondering if it's a case of the current US administration trying to look tough after the President suffered a humiliating election defeat.