his argument is flawed because he compares natural language reading (English) to code reading (C++). They are two very different things.
Recoloring/highlighting individual words in English text is distracting because people don't focus on individual words, they skim and find recognized patterns and form the bulk of the material mentally.
It's why sectennes lkie tihs one are eslaiy redabale, depstie bieng hrobrily misplpelsed.
The same is not true of code, as you have to focus on and fully understand every nuance and every single character, down to the most discrete punctuation mark. It's an entirely different style that demands a different mindset.
I don't know, I kind of agree with him to an extent. But at the same time I like syntax highlighting. I find it easier to find exactly what I'm looking for rather than if it were all black text on a white background.