∀ {C : Type u_1} [inst : CategoryTheory.Category.{v_1, u_1} C] [inst_1 : CategoryTheory.Limits.HasZeroMorphisms C]
  {S : CategoryTheory.ShortComplex C} (self : S.LeftHomologyData),
  CategoryTheory.CategoryStruct.comp (self.hi.lift (CategoryTheory.Limits.KernelFork.ofι S.f ⋯)) self.π = 0