The article documents what diet is generally good for for the general population with no health issues.

Most people want to know what good for other people, rather what is specifically good for them as an individual. In my view there is a considerable variability between individuals.

For people with illnesses there is documented variability - for example, which is worse for someone with diabetes - boiled rice or ice-cream? Actually for many sufferers, it is boiled rice!

And we are talking about known conditions. I was diagnosed with an autoimmune condition in April 2018, though I have good reason (symptoms) to believe that I have had it since at least the 1980s.

I've written just one article on the topic which references a study for people with diabetes, with more planned:

https://medium.com/the-innovation/can-an-anti-inflammatory-diet-help-covid-19-sufferers-28557ff6df6f