Interesting that he brings up the story of Er. Plato made all the arguments when it comes to philosophy’s why and how. The story of Er is the comprehension test at the end of the book. Sadly, Tim did not pass the Er’s test.
Not sure “intended interpretation” can be used to describe anything in the Republic.
The Republic is written to guide human souls out of the cave. Can the curious readers find the truth themselves in the story of Er upon careful examination? Is Er a philosopher? Does a philosopher need rewards described by Er? Can a philosopher choose an inconspicuous life (especally after the disussion of the philosopher’s life earlier in the book)? Can you take a story given in a book as the truth without examination after prose was denied place in the Republic?