The grounds for calling this world apparent establish its reality; another kind of reality cannot be shown

The passage

The grounds on which "this" world has been designated as apparent establish rather its reality; another kind of reality is absolutely incapable of being shown.

GD, »Die ›Vernunft‹ in der Philosophie« 6, »Erster Satz. Die Gründe, darauf hin "diese" Welt als scheinbar bezeichnet worden ist, begründen vielmehr deren Realität, - eine andre Art Realität ist absolut unnachweisbar.« The map reads the grounds meant as those section 5 names, the »Vernunft-Vorurtheil« that posits unity, identity, duration, substance, cause, thinghood and being (p-gd-vernunft-5-will-as-cause). The second half, that another reality cannot be shown, does not by itself deny Kant's c-kant-things-in-themselves-unknown, which says that things in themselves are unknown, not that they cannot be shown to be; what Nietzsche adds is the first half and the fourth proposition, c-nietzsche-dividing-world-true-and-apparent-is-decadence.