It also shows $35mm in investments in securities and $56mm in other tangible assets.
So, he's sitting on $92.5mm and not $100mm.
To me, "sitting on" implies a lack of use, and revenue these investments and other assets are employed to offset expenses, and, even then, only to a small extent compared to the total expenses. Most of the revenue is donations.
It's unclear from IRS filings what portion of those assets are actually employed in the business operations, but I think that our difference is in what is meant by "sitting on" them. I wouldn't say that a business that owns employee desks is just "sitting on" those assets. The chairs, however.... ;-)