One thing that stood out to me was the author's idea that creatine is not beneficial for women to the point where we may as well skip it. There is research showing the opposite of what the author has stated. Example: https://www.ncbi.nlm.nih.gov/pubmed/9390981
Creatine, as he says, is among the most widely researched supplements. Aside from providing potential cognitive benefits it has been shown to be effective for both men and women working toward strength gains. And as another user commented, creatine supplementation could very well explain part of the great weight gain the author claims to have experienced as it causes muscles to retain water and appear bigger (in both genders).