Perhaps not, but he didn't say that. There is more than just language at play in this scenario. Will a native widget, initiated by Python, out perform JS/CSS/Node-Webkit ... maybe.

The OP saying the app will run faster is not refuted even if NodeJS runs some things faster than Python.

I'll refute it. Python is slow as balls.

I use it daily and at my job, and it's flat out slower than node for desktop applications.

(caveat; the pypy isn't as bad, but it has a terrible start up time and no widget libraries worth talking about)