Communities aren't fungible (in the sense that the actual particular culture and values of a particular group of people living in a particular area do have an extreme impact on that area) but also communities are not defined by particular areas that people live.

People who are from the same community tend to settle in particular areas and I think that is what the author is getting confused by.

Also many people in the developed world don't really have any community that they're a part of at all.

If you're interested in learning more about this you can look up the phrase "covenantal vs majestic community".