The only number you can trust is an SEC disclosure of how many public company shares an individual owns. And even then, you can't sell all of those for cash without tanking price / taxes. Plenty of people who decline to be on the "lists". People who opt into lists a likely doing so for marketing.
Related: on paper "net worth" != liquid net worth
while this is true, even if estimates of his net worth are off by an order of magnitude the argument estill seems relevant