This is incoherent. Xi has administrative control (or influence) over state enterprises, but he isn't getting profits or stock options from them, so there are no grounds for calling him a billionaire

communist party top leaders use there position to gain control over the state controlled businesses

This is like saying you became a police commissioner to gain control over local police cars. Yeah, an explicit part of your job is that you can direct them, but the claim is so tautological that it looks like you are saying something else. It's not like Xi will retain control of these enterprises after he leaves office.