That’s possible. Assuming he donates the $2.6 million regardless, this could be a high risk, high reward campaign.
So while saying “please donate” might get say $100,000-$1,000,000 more, even a single bid from a other investor/founder who wanted bragging rights for beating PG will dwarf that.
If so it presents an interesting mechanism to elicit donations in rich social circles.
You get press for being the good guy and don’t have to spend a dime. What a great thing to be able to achieve.