You linked to How Not to Die, which is by the same author as How Not to Diet.
He advocates WFPB. I have read How Not to Die and it was more interesting and funny than I expected. It’s a good tour of the scientific studies related to the foods correlated with the most common causes of death.
Studies about longevity have reached the conclusion that WFPB is best for long life as well. The Blue Zone diet focused on longevity also emphasis a plant-based diet with less processed food.
Mozilla could have allowed people the option to subscribe for a modest fee in addition to giving it away for free, to diversify their income and be less dependent on Google, but they have not been trying that hard to develop other revenue streams.