While the goal post keeps moving, it’s the opposite of your statement. As explained in the article:

That target would represent a doubling in spending for the nonprofit, which has disbursed more than $US100 billion since it was co-founded by Bill Gates and Melinda French Gates in 2000. Originally, the foundation was set to close 20 years after the Microsoft co-founder’s death.

“I have decided to give my money back to society much faster than I had originally planned,” Gates, 69, wrote in a statement. “I will give away virtually all my wealth through the Gates Foundation over the next 20 years to the cause of saving and improving lives around the world.”