Patrick's methodology wasn't a secret. Outsiders realized that his belief that there was little correlated risk couldn't be true.
Outsiders to Bitcoin in general - such as yourself - make all sorts of basically stupid but otherwise wild claims. The fact that they make them rends them no particular validity.
It's clear that you are absolutely determined not to learn anything from this fiasco. I hope others are not so stubborn. Your complaint is that Patrick did not do the impossible and you fail to take any responsibility for failing to realize that this is what you were expecting him to do.
It doesn't matter whether it was impossible to fully determine the risk - what matters is that Patrick is responsible for shouldering the risk because nothing in writing stated otherwise. And because Patrick did not fully disclose all of the information that would have made the extent of the risk "common" knowledge, it cannot fall under the "common mistake" rules that you keep coming back to.