Don’t know for sure but have you seen the house he just bought on Martha’s Vineyard? That place must have cost $30-$40 million at least.
Since I'm in MA, I knew it was in Dukes County, Mass. I looked it up in the online registry.
It was listed for something like 14.5 million, but actually sold for around $11.5 million. 20+ acres on the shore. No mortgage. You can look it up yourself, either in the deed registry of Zillow. 79 Turkeyland Cove Road, Edgarton, Massachusetts.