He obviously already did that, as he met the Patriarch.
Looks like you have a mindread skill IRL, amirite? Since he didn't mention that he met Patriarch (perhaps he did read a walktrough and now know whose cave is and what lies after these statues).
What's about the way to reach a chest in the Patriarch's nest - there is none, the cake is a lie.
About so called "secret passage" - just a broken map. If you look closely you will see that map is incorrect in many places, not just there.
