The protein requirements of a human don't change based on diet. For someone following the most common omnivore eating pattern they are already eating 15% of their energy from animal sources (i.e. the meat)... Carnivore means taking the other 75% and replacing it with fat.
Carnivore shouldn't be scary - you are already eating the meat, its just swapping the plants with natural unprocessed sources of fat.
The total muscle meat consumed stays about the same... however, the people who try it tend to get more healthy and energetic and as they become more active their protein requirements scale up a bit... but that is a happy side effect.
Effectively - switch to more fatty cuts of meat, more butter, cooking fats from animal fat instead of oil. And.... let's be honest, most people have a few extra kg they want to lose, so the body will naturally use that fat source too!
