For those who don't know the definition:

"In economics, a public good is a good that is both non-excludable and non-rivalrous"

"A good is considered non-rivalrous ... if, for any level of production, the cost of providing it to a marginal (additional) individual is zero"

"... a good or service is non-excludable if non-paying consumers cannot be prevented from accessing it."

I suppose "public service" is technically the more appropriate term. But it is a public benefit in the sense that healthy people can contribute more to a healthy economy.

You know what he's saying though.