It's odd, but while I don't disagree with those stats, as someone who grew up in philly->baltimore then moved around the country for work, I had a FAR more integrated friend group in either of those two cities than anywhere else, where it's almost purely indian+asian+white. (in that order, actually).
Likely due to net-population-availability of minority groups, and I won't disagree that many neighborhoods are almost entirely black (stayed with a friend living off diamond st one time), but I will say that one shouldn't then draw that to mean everyone in those cities also lives along the lines of such segregation. (To try and explain why the parent, and myself, had an experience that didn't always align intuitively with those articles)
What I'd also call out though that I wouldn't have noticed outside of having grown up there, is that I'd draw the lines there FAR more aggressively along socioeconomic boundaries, which just so happen to correlate with race. Not even starting to turn this into a discussion about which direction the correlation moves in, but I'm always hesitant to paint it soley it as a racial problem.