Why can Coca-Cola's formula be kept secret? Isn't it written on the ingredient list? Even if it is confidential, can't it be tested?

I remember that when Coca-Cola was cooking, 1% of the mysterious raw materials were top secret only known by the company's top management. Although the current technology can detect its composition, the production process can not be separated from the conditions such as the time and temperature of adding raw materials, not just knowing the composition.