The comparison isn't really that good because those cities are smaller ones anchored by the 4M+ giant of LA, but his point seems to be how natives feel about it or can project.You don't think Palos Verdes and Compton are different?
Even "similar" demographics like Inglewood and Long Beach, those cities are nothing alike if you've actually lived there. Come on now.
A Compton native and Palos Verdes can claim LA in some way and wouldn't look at each other funny.
A Newarker can't claim Paterson, a Paterson native can't claim Elizabeth, an Elizabethean can't claim Jersey City without it being off.
But the missing ingredient is the 1M+ national scale city that these 100-300K cities would orbit around. Jersey doesn't have that because what our most densely populated county should be, is that city.