Yeah it's unconventional, but who cares, it's not like it won't work. It's not entirely far-fetched but it's just not optimal.
If you're going to write a guide and your elo does not make you 'credible', per-say, the least you can do is structure it so that it's clear, straightforward, and professional. He's not hiding the fact that he isn't the most seasoned player but he clearly put forth effort into writing it. It's silly to imply that he doesn't deserve the commission.