Which is as it should be. First of all, marriage is a covenant. If someone cannot be trusted to keep his word on that, it's tough to trust him with power over thousands of employees and trillions of dollars. Second, I'm guessing the board asked Huang after the first affair's revelation whether there were more skeletons in his closet, and he said no. Lying to one's board is more than enough reason to be ousted.
From a religious perspective, sure. From an earthly perspective, you don't know what the other side was doing. Have you ever been married to a menopausal or a post menopausal woman? A marriage in which there is a permanent refusal to have sex can be annulled.
Seems like some weird fundamentalist take. On its own it's purely a private matter between him and his wife (obviously the GPU smuggling stuff is a separate thing). Given that the affair has been semi public for years it's hard to imagine his wife didn't know about it anyway.
> marriage is a covenant
That's a very narrow view that's a function of one's religion, culture, and values.
When I was in school, (US) my very Catholic French teacher explained that his uncle, in France, had a mistress. His uncle's wife knew and was okay with it. What my teacher was explaining is that the culture around marriage varies considerably through the world, and you can't take for granted that what we were taught (monogamy) is the standard that others live to, or even expect from you.