His company has value. As long as he didn’t dump all the shares at once he could surely unwind his stake to the market. We’re not talking about bitcoin or beanie babies here. There’s an underlying asset.

Sure there’s no doubt about that, but the context is that this dude doesn’t spend a lot of time thinking about his net worth and folks here are somehow judgemental of that

I mean, you could say the same thing about the assets of a hedge fund. But it turns out that if you want to, you can convert most assets to cash. Of course, the more quickly you want to convert, the more money you lose.