No, he's arguing that asking somebody else to spend an hour of their time to install a gem is placing extra barriers to people experimenting with the software that came with their computer.
Funnily enough, I've never heard anyone mention it before this whole ruckus, even though installing Xcode was a requirement to get gcc in the past. No one has taken the time to build it themselves with the source that Apple gives out for free and host it for those that don't want to install Xcode.