This article completely misses the biggest advantage of NodeJS - being able to run the same code both back and front end.
Sure, most features you're using Babel for are also available via enabling some v8 flags, but you can't do that on the client side.
With Babel + Webpack you can have largely the same codebase on both frontend and backend, saving huge amounts of time and effort otherwise wasted writing separate logic for the browser, and allows you to manage your front-end dependencies with good ol' npm, instead of doing so manually by hand.