I don't see how that jives with the paper, given that at follow-up, almost half of the people were on a vegetarian diet.
It looks like she only has one paper on PubMed, where she is listed as "Independent Researcher." The paper makes no mentions of plants:
https://pubmed.ncbi.nlm.nih.gov/35873236/.
She does mention the SMILES trial, but that states the opposite:
https://bmcmedicine.biomedcentral.com/articles/10.1186/s1291...
the available evidence from observational studies suggests that diets higher in plant foods, such as vegetables, fruits, legumes and whole grains, and lean proteins, including fish, are associated with a reduced risk for depression
and
ModiMedDiet diet:
The primary focus was on increasing diet quality by supporting the consumption of the following 12 key food groups (recommended servings in brackets): whole grains (5–8 servings per day); vegetables (6 per day); fruit (3 per day), legumes (3–4 per week); low-fat and unsweetened dairy foods (2–3 per day); raw and unsalted nuts (1 per day); fish (at least 2 per week); lean red meats (3–4 per week) [32], chicken (2–3 per week); eggs (up to 6 per week); and olive oil (3 tablespoons per day), whilst reducing intake of ‘extras’ foods, such as sweets, refined cereals, fried food, fast-food, processed meats and sugary drinks (no more than 3 per week). Red or white wine consumption beyond 2 standard drinks per day and all other alcohol (e.g. spirits, beer) were included within the ‘extras’ food group. Individuals were advised to select red wine preferably and only drink with meals. The dietary composition of the ModiMedDiet was as follows: protein 18% of total energy (E); fat 40% of E; carbohydrates 37% of E; alcohol 2% of E; fibre/other 3% of E.
Note that we don't directly get energy from most fibers, so 3% energy does not mean 3% of the volume of food.
Getting rid of plant/fiber from your diet is probably a terrible idea, unless you have a specific reason to do so. That's because if you don't give your microbiota something to eat, then it will eat you (starting with your mucus).
A dietary fiber-deprived gut microbiota degrades the colonic mucus barrier and enhances pathogen susceptibility
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5131798/
Bifidobacteria or Fiber Protects against Diet-Induced Microbiota-Mediated Colonic Mucus Deterioration
https://www.sciencedirect.com/science/article/pii/S193131281...
In people who have trouble digesting plants, they may have already lost the part of their microbiota which would digest the plants. So when re-introducing plants into your diet, you should do it gradually so that it doesn't overload your biota.