Thanks for the link. Here's a brief review of its content.
First of, it's a review of a selected sample of scientific literature - a small meta-analysis. Whether the sources he cites are credible or not is another matter. What's evident is that it is definitely not a scientific study in the proper sense of the word, meaning that he didn't conduct an experiment on a sufficient sample size. He simply came up with a hypothesis and tried to find other studies that helped support his claims. Meta-analyses are sound scientific tools but usually not when it comes to "proving" anything related to a controversial topic, such as the effect of nutrition on male pattern baldness.
Now as for the conclusion of his review, while it is true that nutritional deficiencies have an impact on hair loss, possibly accelerating Androgenetic Alopecia - or, let's entertain the notion here, trigger it -, the solution he suggests is suspect at best.
Consider the following quote:
Yes, the quality of our food is different, or maybe even not as healthy as the food available a hundred years ago. However, unless a subject suffers from a mental illness (anorexia, bulimia, etc.), no one in the developed world suffers from malnutrition, at least not in the accepted sense of the word. Maybe in India the poor cannot afford proper food but plenty of people can in Europe and in the US.
Here's the thing. Both studies from other scientists and anecdotal reports from hair loss sufferers have tried to affect Androgenetic Alopecia through diet. Several angles of approach have been used - vitamin C, D, selenium, zinc, you name it. None have shown any tangible amount of success in modulating androgenetic alopecia. The conclusion would be, either it doesn't do anything or it's just not enough to stop Androgenetic Alopecia, let alone slow it down.
In conclusion, don't chase windmills by going down the "natural" path to try and treat hair loss. Having a healthy lifestyle probably helps with hair loss but proper exercise and nutrition are sadly no cure for Androgenetic Alopecia.