9Pack probabilities

If you notice when you highlight a packs probabilities. At the bottom is a web page, where you can go to to find out more about details of how it is generated. However. Once there. All they divulge is the construction of how they go about this mystical way of pack probs. They do not give any formula or computation, as to how the odds are actually generated. They dont even give you an example of this computational simulation they talk about. So without actually knowing  how the odds are actually generated. How can we trust the accuracy of said odds. For all we know. This maybe nothing more than someone tossing out #s, with no way to prove the validity. Why i have always been sceptical about the odds of packs. A pack may say 80+ 100%. But then again the pack has cards in it below 80. By not divulging the probabilities of all cards. The system is devoid of true accuracy.