This guy has likely not prototyped in environment such as Jupyter notebooks or ptipython. It is not just language - there is whole ecosystem build around Python scripting: pandas, matplotlib, numpy, etc. And don't forget about debuggers and IDEs once your projects grow out of scripting environment. Did I mention hooking up to GUI or web app?
I've done a lot in those kinds of things, actually; they're awesome. I don't feel obliged to mention every possible alternative in every blog post; that would be absurdly tiring to do, and probably wouldn't add much value. (Edited so it didn't read as hostile as the original version of the comment did.)
