Actually speculation is that twitter and general poor decision making may be overextending him.
He still has more "worth" than any of us can ever dream of. But he doesn't have the liquidity to do anything with it. And considering the strong indications that it is the Saudis and possibly the Russians who bankrolled a lot of the twitter shit...
A good way to think about it is this: Your friend from college who actually managed to buy a house a couple years back? They have more "money" than most people you know. But, unless they are willing to sell that house, they can't do anything with it. So they are still living based on their paychecks and savings in the bank.