There's no meal plan that works perfectly for each person. It may include foods that you don't like/eat. It may include ingredients you've never heard of or simply too costly. Most commonly, it won't fit with the right macros for your specific goals.
The suggested meal plan was created with that in mind. The minimum recommended caloric intake is 1200 for women and 1800 for men. Since every keto diet practitioner will have different macros to reach, this plan is created based on the 1200 calories.
The meal plan provided is only a suggestion to help you transition to a keto diet. The recipes are interchangeable, so you may pick and choose from the suggested recipes and create your own menu to better fit your food preferences.