The var dump function should give you all the information about a variable or data value. In this case when you pass the session object to this function it should print out all of the session variables that are set. The reason I'm wanting to see these values is because it is these session variables that are used by the access rules to restrict the content.
Based on what you got either the session variables are not set at this point or the session has not been started. Please add in this one line just before this var_dump function to ensure that the session is started:
Please add this into the page just above the other var dump code and test again to see if the result changes. If needed I will open a ticket for this so we can exchange some files privately.