I had the same experience -- it was way easier for me to find it with the rainbow highlighting (even though I already knew where to look when it came to the monochrome highlighting!).
The author later asks what color class definitions were. I think this fundamentally gets wrong how syntax highlighting helps humans. I don't have a clue what color anything is in my favored highlighting, but my brain does incredible pattern recognition to help me digest code in it without me consciously knowing what color does what.
So his arguments for why there's a problem don't hold up, but that doesn't mean there is not in fact a problem.
The author later asks what color class definitions were. I think this fundamentally gets wrong how syntax highlighting helps humans. I don't have a clue what color anything is in my favored highlighting, but my brain does incredible pattern recognition to help me digest code in it without me consciously knowing what color does what.
So his arguments for why there's a problem don't hold up, but that doesn't mean there is not in fact a problem.