∀ {R : Type u} [inst : CommRing R] [inst_1 : Small.{v, u} R] (M : ModuleCat R)
  {S : CategoryTheory.ShortComplex (ModuleCat R)} (h : S.ShortExact) (n : ℕ) [CategoryTheory.Projective S.X₂],
  Function.Surjective ⇑(h.extClass.precomp M ⋯)