The article looks like a summary of Marty Kendall's Optimising Nutrition work.

By using the Cronometer tracking app and his Nutrient Optimisation app, you can learn your intake of 34 nutrients that may impact your health. His conclusions have been developed from MFP users and the data from his own group, so not the low income countries in focus here.

To find out which micronutrients in general may be low in your diet, there are many articles on his blog about Nutrient Density:

https://optimisingnutrition.com/wha...trient-density/

https://optimisingnutrition.com/nutrient-density-101/

And a class to determine what you specifically need using your own diet:
https://optimisingnutrition.com/micros-masterclass/