I think the site can be a very helpful as part as an overall education in learning about dog foods. Some people don't believe we should learn about the ingredients, we should just trust the companies to do what's best for our dogs, since they hire vet nutritionists. I think the site has much improved from it's earlier beginnings when ingredients weren't always kept up to date, but just because the author is a dentist, instead of a vet nutritionist, it doesn't mean the information is poor. He's not designing a diet, he's just telling you what's in those foods and what nutrition it provides. Here's another site that has helpful information,
The Dog Food Project - Myths about Dog Nutrition. I'm glad you are learning about nutrition!
By the way, you can also learn about dogfood recalls there.
Dog Food Recalls | Dog Food Advisor