Then that's a terrible reading of Nietzsche — Sirius
Nah, you're just trying to reify what I'm saying through your filters and it's not registering because, you simply haven't the right optics for understanding. A similar but all together different set of stimulus receptors after all.
Nietzsche has many facets, that metaphysics is fictional doesn't mean it doesn't exist within thought...it's conceptual device created by humans.
As to knowing your Nietzsche it's obvious you didn't get his take on grammar
Nietzsche on Truth as a seduction via grammatical construction:
Suppose truth is a woman, what then? Wouldn't we have good reason to suspect that all philosophers, insofar as they were dogmatists, had a poor understanding of women, that the dreadful seriousness and the awkward pushiness with which they so far have habitually approached truth were clumsy and inappropriate ways to win over a woman? It's clear that truth did not allow herself to be won over. And every form of dogmatism nowadays is standing there dismayed and disheartened - if it's still standing at all! For there are mockers who assert that they've collapsed, that all dogmatisms are lying on the floor, even worse, that they're at death's door. Speaking seriously, there are good reasons to hope that every dogmatism in philosophy - no matter how solemnly, conclusively, and decisively it has conducted itself - may have been merely a noble and rudimentary childish game, and the time is perhaps very close at hand, when people will again and again understand just how little has sufficed to provide the foundation stones for such lofty and unconditional philosophical constructions of the sort dogmatists have erected up to now - any popular superstition from unimaginably long ago (like the superstition of the soul, which today, in the form of the superstition about the subject and the ego, has still not stopped stirring up mischief), perhaps some game with words, a seduction by some grammatical construction, or a daring generalization from very narrow, very personal, very human, all-too-human facts. — Preface BGE
Of which he goes through several of these seductions through the opening of BGE...
And furtherstill we see in books like Twilight of Idols Nietzsche details that grammar shapes how we view the world in Reason in Philosophy...
Nothing indeed has exercised a more simple power of persuasion hitherto than the error of Being, as it was formulated by the Eleatics for instance: in its favour are every word and every sentence that we utter!—Even the opponents of the Eleatics succumbed to the seductive powers of their concept of Being. Among others there was Democritus in his discovery of the atom. “Reason” in language!—oh what a deceptive old witch it has been! I fear we shall never be rid of God, so long as we still believe in grammar. — Twilight § 5 Reason in Philosophy
How is it that grammar creates Gods? By the way we end up categorizing
things. The "will", or "nature" or "God" all
unify a multiplicity of experience stimuli into a single word—a daring generalization—that exists as is, as the thing in itself...you can check out more on that via BGE 19 and 24, and Twilight: The Four Great Errors § 3
The Error of False Causality.