The advice in this article seems a little pointless as there are far better aspects of nutrition that could have been covered here for athletes.
I also find it quite irritating that this article is giving dietary advice yet has not sought the opinion of a Dietitian or a Sports Dietitian. These health professionals are the ones who have spent many years in training on the subject and therefore would be best informed to give such advice.
Instead you take the opinions of a nutritionist, who by the way does not need any type of formal training and can call themselves such after reading an article from the internet, as well as some science professor. Next time it would be better if you consulted someone more qualified, so that they could give advice that was actually useful.