∀ {ι : Type u_1} [inst : Fintype ι] {c : NNReal} (l : BoxIntegral.IntegrationParams) (I : BoxIntegral.Box ι)
  (π₀ : BoxIntegral.Prepartition I),
  π₀.distortion ≤ c → π₀.compl.distortion ≤ c → (l.toFilterDistortioniUnion I c π₀).NeBot