Even if he has a net worth that is legitimately where he claims(it isn't), he would not have tens of millions available. All his money would be in properties, bonds, stocks, and some squirreled away in Russian nesting dolls of accounts overseas. You don't keep millions in the bank when inflation is where it is at, putting it in property or other assets is safer and more profitable.
With actual billions in net worth, he would probably have to lose tens of millions to have $83m transferrable in "short" notice and it could take weeks.
The $83m is probably doable, the half billion is probably going to need outside financing or property loss. So we will see a better picture of things when some of his properties go up for sale at a deep discount compared to his appraisal. Lol