Do you seriously not get that things change if it's for a person's job?
A male model might spend one hour a day grooming himself, applying various skin care and hair care creams, etc, and that's fine. It's fine because it's for his job, so it makes sense, and he will likely get great results. He's also at an elite level where a 1% change can matter. However, if you or I were to do it then it would not make as much sense. I'm not sure if you get the point of the analogy, but it's rather simple.
As for "eating as many nuts as you want", Jesus Christ : facepalm:. Unless you dip them in chocolate or something or you have a hormonal issue, tree nuts should trigger a satiety response. You're not going to gorge on them.
About you keeping track of your caloric intake -- do you also keep track of your metabolism by logging your resting heart rate, body temperature, wakefulness, etc? Or are you ignoring the first law of thermodynamics by only tracking "calories in"?
ETA: I never wrote that you can't track your calories within a factor of 3. Is English your second language? Realistically, tracking calories from day to day with a 20% precision is probably fine.
Also, I've realized another error in your reasoning. You're assuming that if something works for an elite athlete then it will work for you. That doesn't follow at all. Elite athletes have genetic advantages, including excellent adaptiveness to exercise, low insulin resistance, etc.