First of all, Nietzsche considered Thus Spake Zarathustra to be, what it essentially was, a poem, and elsewhere Nietzsche wrote: "Poetry is useful It can tell Te truth by means of parable To those who are not so bright." I too have read it, but it cannot be taken to clearly state Nietzsche's position on anything because it's a poem. And he also states, in
Ecce Homo, that one should read Thus ...