This is a signal that they have phrased their values well. A good values statement should polarize. It should disgust people whose ability to work effectively would be poisoned by the culture that leadership strives to maintain.
A recruiting process which discriminates against people who do not share their values will create a more secure sense of belonging among people who do -- even among underprivileged groups who would otherwise worry they do not really fit in.
Who cares? Even giving credit to the point I think you're trying to make, the relevant comparison would be employees from underprivileged groups stay at Netflix as long, on average, as Netflix employees not from underprivileged groups.
