Bear in mind that training plans are never absolutes. They’re always built relative to the fitness of the athlete. The plans in the book are based on the best estimate of a generic runner at a certain level.
So if the plan varies from your current fitness, it’s fine to adjust it. More important than the absolute numbers are the relative changes in volume and intensity. Think in terms of percentage changes from week to week, and then apply those to your own training plan.
Does that make sense?