Nietzsche's Global Readership Claim: Insightful Foresight or Grandiose Delusion?

Was he engaging in tortured self appraisal due to the low success rate of his writings, or did he possess genuine insight about the future? It's puzzling to reconcile his lucid and persuasive reasoning with the possibility of delusional thinking (if that's indeed the case).

"This was said for Germans: for I have readers everywhere else – nothing but choice intelligences of proved character brought up in high positions and duties; I have even real geniuses among my readers. In Vienna, in St Petersburg, in Stockholm, in Copenhagen, in Paris and New York – I have been discovered everywhere: I have not been in Europe’s flatland Germany…" (Ecce Homo, 1888)