Yes and no. He may not shoot bolts of Void energy around but the (alternate) Nagrand questline blatantly implied that Warsong shaman around Oshu'gun were able to enslave the elements thanks to the abundant Void energies seeping from Ku're's dying form. The same pretty much occurred with the Pale Orcs and their enslavement of elementals on Cho'gall's order. The first Chronicle volume also connected Dark Shamanism to Necromancy.
That was my point overall. And there's a difference between corrupting and directly boosting someone's power. Sure, Deathwing got a power boost out of that corruption but merely because his already existing power have been twisted by the Old Gods to fulfill a more destructive and offensive purpose. In fact they messed him up so much that he basically turned into a flying weapon ready to blow up at the right moment.Neltharion was corrupted but he didn't tap into the void, he just twisted his own original powers.