What I don't understand about that is this: if it was important to you that an area was totally white, you'd be lured in by that advert (and be a total dick, obv...) - but don't the developers think that you'd visit before buying, and therefore see the reality of Dalston?
Looks like only white people live in Dalston now
https://www.youtube.com/watch?v=6q-4ry6O13s&feature=youtu.be