Is the development-friendly environment of Rails such that someone would be using it for WordPress? I thought it is was mainly for application dev?

I saw a website today for a self-taught freelancer listing his html/css skills, and affinity for Rails/Git. Nothing about Ruby or application development. But based on links to client websites, he's working mainly on simple WordPress sites for small businesses such as artists and photographers.

I am in the process of installing Rails for the Michael Hartl tutorial, though I'm not sure I have the resources to devote to playing around with Ruby and app development right now, so seeing this has thrown me for a loop.