I am not aware of any documentary re Hitler on Netflix, "anti" or otherwise. As with all things DUmmy, this exchange did not actually occur.
That said, Netflix is like every other purveyor of pop culture nowadays, meaning all shows feature hyper-sexualized kids, drug addiction, and every other affront to family entertainment imaginable. I, for one, am tired of pretending that a black mother, a Latino father, and two Hmong children is "normal." So I watch almost no new television.