I would bet that they are using the area in between the 7's and from McDowell to Lincoln, and I'd venture to say that the 9,000 is probably correct. 9,000 people really isn't that many, and between the apartments, condos, and the neighborhoods within that area, I'd say that 10,000 people wouldn't be too much of a stretch. Still dismal numbers for what should be an urban area.
By the way, along the lines of urban dwelling, the Shemer Art Center on Camelback and Arcadia is having an exhibition called MicroDwell, focusing in minimal living. It is definitely something worth checking out for those of us who advocate for denser living.
Here is the museum's website:
http://www.shemerartcenter.org/