[Borges]

But for once Nietzsche is nowhere in sight

He's nowhere in sight in Wagner's other operas either which predated Nietzsche's writing.

[wideawake]

True. Wagner and Nietzsche were only close from 1871-1876: the only opera that Wagner did any serious work on while he knew Nietzsche was Parsifal - which Nietasche hated and which is pretty opposed to Nietzsche whole worldview.

Wagner's other great works: The Ring, Tristan, Tannhaeuser, Lohengrin, Meistersinger, etc. were almost all written and composed by 1870.

Nietzsche met Wagner briefly in 1868. He didn't begin hanging around the Wagner household until 1871 and he didn't become famous himself until 1883 - five years before he entered the laughing academy and seven years after he broke with Wagner.

I doubt Nietzsche had any effect whatever on Wagner's work.