Cool, that's perfectly reasonable.
> We are all guilty of it, no doubt.
This might sound facetious, but don't you see the contradiction here? Towards the proposition "These are the principles Dalio used to achieve success", you are skeptical. Towards the proposition "people erroneously construct narratives regarding cause and effect in their lives", you have no doubt that it applies to all people.
Why not apply skepticism towards the second proposition? Maybe somewhere on the planet are people who are able to examine their lives without constructing false narratives.
The reason I am not being facetious is that skepticism is extremely popular amongst intelligent people, but it leads to such contradictions in practice (e.g., "I know that all knowledge is biased").