Its more about the cave, less/nothing about him.

a) Nothing implies suggested nihil-ism (nihilo; nothing) tempting ones de-nial of everything perceivable...this denial/ignorance implies the cave.

b) Less implies ongoing loss (inception towards death) for temporary growth (life)...others tempt one to build a cave of ignorance/denial within self to corrupt that growth.

c) Him implies the suggestion of another to conceal how spreading (plato) and fitting together (artistocles) influences oneself from within.

tl;dr...nature reveals everything; few within use names like Plato + Artistocles to conceal from many what nature reveals.