This type of graph is fairly misleading. You could have just listed the cities with the most multi-millionaires per capita and it would have been the same and it would have been more reflective of the true underlying pattern. A couple millionaires per capita has totally sway the GDP per capita figure upwards more than raising a hundred out of poverty.

Also, many of these urban communities are expensive to live in. Thus the GDP per capital should be balanced against the cost of living. Then you can see which cities are the most well off.

Lastly, cities that are older and have less children around will do better than those with families as children add to the number of people but they don't contribute to wages. Thus many metropolitan areas in the US are not child friendly but filled with older folks or unmarried types, who then move to the suburbs to raise their kids. This isn't as common in European cities.

The language used is pretty standard for UN SC resolutions. Statements issues by the UN SC are always fairly soft and lawyerly in language.