It doesn't really answer this question, but the show #blackAF on Netflix helped me learn a bit more about black people in America. For example, fatherhood is challenging for everyone, but the expectations on black fathers is a bit different. This show portrayed those challenges well.

There most certainly is an ingroup-outgroup dynamic, but I don't think a Black Netflix intensifies it, it merely caters to that audience, just like Netflix is doing with #blackAF or DisneyPlus is doing with blackish.