They aren't. The article is about renting a 2-bedroom home. And nowhere do they limit the definition of "home" to "free standing, detached dwelling" - I believe their figures include 2-bedroom apartments as well.
Apologies- I meant to write rent. Even if their numbers include 2 BR apts, my point still stands: a single person affording rent for a 2 BR apt is not a reasonable baseline for a living wage.
