His experiences only work for a few people. For example, Node.js is one the top programming languages being used now, how do you develop with Node.js in the iPad Pro? Java? C/C++? Go?
A well set up Vim or Emacs is perfectly capable of writing Node.js, Java, C (side note - hilarious that you tried to use this as an example, given that C and C++ are probably written by a majority of developers in the console) and Go.
We can assume if it's working for them then network connectivity isn't an issue (which is isn't for most of us, most of the time).
Node.js is not a programming language. It's a framework. I currently develop Node.js for work, and I always SSH into a remote machine to run tests and do development work. Developing Javascript, C, Go, and Java over a ssh connection is doable, one of the best options in the case of C and Javascript.
No, he doesn't. He speaks of his own experiences.
In fact, he states as much very clearly in the introduction: "The Mac and the iPad can coexist in a market where customers believe one is superior to the other. I prefer working on the iPad; others like their Macs more. And that's fine[...]".