I think the commenter was pointing out the lack of depth in the article, the author more-or-less just skimmed the subject. I completely agree with what you've

I think the commenter was pointing out the lack of depth in the article, the author more-or-less just skimmed the subject. I completely agree with what you've said, it's a process I came to on my own over the course of my self education. Mnemonics, closed-eye review of material, note taking, and spaced repetition of important memorizable information (which takes a discerning eye to determine) are the key skills and habits that make my readings more efficient and effective.