And while they have it marked false, their writeup concedes it's true:
"The computer magnate believes that vaccines can be used to reduce childhood mortality and ultimately reduce population growth through associated social changes, not as an agent of death."
This 2017 Snopes article is interesting.
"Did Bill Gates βAdmitβ Vaccinations Are Designed So Governments Can βDepopulateβ the World?"
And while they have it marked false, their writeup concedes it's true: