That's the claim and I used to echo it, but with near daily walks (weather permitting) plus hikes when weekends permit, plus gardening, I'm still deficient. Same story for almost everyone I work and exercise with.
There's either more to it or the claim doesn't hold up empirically
My health tip is remove plastics from your kitchen as heating, cooling, flexing, even gentle abrasion puts microplastics all over the surfaces and your food.
Then get rid of all your clothing, sheets, etc that are made of plastic fibers (polyester, nylon, acrylic) as every time you move or wash them it geterates microplastics for you to inhale or otherwise consume and live amongst.
Surprising advantages include feeling a comfortable temperature as organic fibers are far better for regulating temperature and moisture, less skin irritation, infections and acne too.
Generally: they might be more resistant to foreign interference, e.g. groups like AIPAC
Specifically: I haven't read into how Morocco is doing yet