Is nodejs' open source community the best one out there? No. Of course not. It's had it's ups and downs as well as it's share of crazy zealots.
I think what this article skips over is not what nodejs does for the open source community but what it allowed.
In the past. The open source community had a lot of very talented people working in their restricted programming languages. Someone would make a revolutionary framework in Python that could not be easily shared with the benefits of another developer that made their breakthroughs in Ruby for example.
With nodejs, you have the best minds combining their efforts to make a server that's accessible to every programmer that touches the web in some way.
Today, the Node.js project is divided into many components with a full organizational size of well over 400 members. Node.js Core now has over 50 committers and over 100 contributors per month. Mikeal Rogers, now community manager of the Node.js Foundation, explained that this innovation has extended into other areas of the foundation.