Please summarize for us why the author thinks that you can build strength better with high reps as opposed to low reps.
The author doesn't argue that anywhere.
Here is what he does claim .. comments in parenthesis mine not the authors
Why HIIT makes you less explosive (doing HIIT means working at a lower intensity, and since it's further from maximal attempts it wont make you more explosive)
● Why aerobic doesn’t equal long distance runs (you can do 20-30 min aerobic workouts that give most of the aerobic benefits)
● Why aerobic training doesn’t take hours (see above)
● Why HIIT is a bad way to burn calories (workouts too brief, not much work is done, EPOC is neglible)
● Why EPOC is overblown (see above)
● Why HIIT isn’t more “natural” (caveman/hunter argument, meh, neither here nor there)
● Why aerobic training is natural (see above)
● Why aerobic work makes you look like a sprinter, not a marathon runner (sprinters actually end up doing a lot of aerobic work in their training as well as the maximal stuff)
● Why HIIT doesn’t burn more fat (calories burnt less than from a good aerobic session)