The article on supersymmetric Wilson loops does use product integrals in the sense relevant to this discussion; it says on p. 11 that it has "presented a supersymmetric generalization of ordinary product integral formalism." His primary reference for product integrals is Dollard and Friedman, Product Integrals, Addison Wesley, 1979, and it seems like a lot of the paper is extending their formalism to the supersymmetric case.

And that's fine, but it doesn't answer the question of notability of Grossman and Katz's work. He doesn't mention them once; nor does he seem to use any of their ideas. Of course, G&K; are (strictly speaking) off-topic for this page; this page is about multiplicative calculus in general, not about their particular version of it.