I'd still consider something to be government-funded if they receive millions of dollars in funding from the government (wikipedia shows $200M in revenue in 2016). [1]

It is relevant that this is a small portion of their budget, but generally when someone thinks "this shouldn't be funded by taxpayer dollars" they don't stop caring just because the millions of dollars spent only cover a small portion of the entity's total budget. Typically these arguments are ideological/philosophical, not matters of degree.

1: https://en.wikipedia.org/wiki/NPR

Huh, fair enough. At that point we may as well pull that remaining 4 percent then. Clearly they’d prefer to go in a different direction anyway.

NPR is government funded, and was established by Congress.