Your post doesn’t follow with the way you now think of cessation.
Anyway, following ajahn Brahm’s pattern in saying that impermanence is not the tv channel changes, but the tv is gone. I would say to apply to the wavefunction analogy is that after parinibbāna there’s no more wavefunction, not just that it’s there but not collapsed. Not even the possibility of arising again ever.
As from this video, the ninth level of nothing is basically parinibbāna.