Not necessarily.
Take something like Paleo eating, where their carbohydrate intake is rather minimal, and they prefer fat intake, for instance.
Yes, they get a large portion of their energy from fats.
Yes, they still eat some carbohydrates (usually vegetables).
It's no bro-science or false to claim that the body needs carbs. It's completely true. If your brain gets 0 carbs, you die. That's simple human biology.