The author is missing the point. If your editor doesn't have abbreviations, snippets, completion, etc., you're doing it wrong.

If you can type above ~80 WPM (which basically just means you can touch type), then using the proper tools your effective WPM is easily above 150 and thus totally irrelevant.

Or put in other words, once you can touch type, you are far better off improving your tools and workflows than practicing typing. In a competition you might train your legs, but in real life you get in a car.