Of course I have zero issues with individuals settling on their own ratios, but this author is attempting a blanket prescription for the malnourished/toxified masses.
As a macrat agnostic my problem with advising 80% anything is that you basically eliminate all familiar cuisine in one fell swoop, which leads to lopsided dinner plates and lackluster texture/flavor substitutions instead of appreciating the highest-quality exemplars from each macro category.
Lots of: urban hiking, cycling, sprinting
Lots of: fresh meat, seafood, eggs, organs, tubers, starch fruits, vegetables, meat fat, dairy fat, oil fruits
Some: cured meat, dairy protein, sweet fruits, rice, pulses, tree nuts, oil seeds
Minimal: soy, refined proteins, sugar, liquid carbohydrate, grains, refined oils, peanuts