∀ (C : Type u₁) [inst : CategoryTheory.Category.{v₁, u₁} C] [inst_1 : CategoryTheory.MonoidalCategory C]
  (F : CategoryTheory.Mon C),
  CategoryTheory.IsMonHom (CategoryTheory.Mon.EquivLaxMonoidalFunctorPUnit.counitIsoAux C F).hom