That compares Powershell to Nant. Nant tasks (inspired by Ant tasks) are more powerful than regular commands. Not even shell commands match those. He's comparing apples with an apple pie there.

I started the article as a nant vs psake (PowerShell based build tool). Psake relies on PowerShell tools for things like copying files, which makes sense.

I'm working on a similar one using make instead, which uses shell commands and it's a lot better than both.