As someone who knows someone at UNC Chapel Hill who was researching this starting about 15 years ago, the research community did not move on, the news just stopped talking/hyping about it.
Here is a recent paper: Oxidative stress: The core pathogenesis and mechanism of Alzheimer's disease
https://pubmed.ncbi.nlm.nih.gov/35395415/
It is fundamentally true that oxidative balance is crucial to health, and that nutrients play a large role in maintaining that balance; Manganese (SOD2) zinc/copper (SOD1/SOD3), Selenium/Riboflavin/Pyridoxine (Glutathione).
Deficiencies will not cause one disease, but many different ones, depending on the persons risk.
I think oxidative balance plays a large role in controlling the microbiome.
Nutrition, oxidative stress and intestinal dysbiosis: Influence of diet on gut microbiota in inflammatory bowel diseases
> Ani Biome uses machine learning models to provide personalized solutions for enhancing gut microbiome function and addressing inflammation, a prevalent factor in age-related chronic ailments.
But they are missing the blockchain component :)