I thought the same while reading the article. My understanding is that carbohydrates are not really bad, especially unrefined ones.

Examine.com has this to say: https://examine.com/nutrition/awful-nutrition-myths/#summary...

At the end of the day, no one knows I guess.

The author is confusing highly-processed white bread and sugary cereals with the grains themselves. Whole grains are some of the healthiest foods one can eat.

https://nutritionfacts.org has a lot of information on evidence-based nutrition, sadly it's mostly videos.