Nah. He could sell most of that stock and it could be put to useful purposes while making no difference whatsoever to his life. It could be used to build housing, or pay teachers more, or build libraries, or found new companies, or pay off medical debt, there's thousands of things it could be used for. Instead he's just sitting on it. This is hoarding.
The only people that should be wealth taxed is leeches like you that see how utterly corrupt the state is with how it handles tax dollars and wants to give it more money.