I think the slinger is there to avoid seal leakage as well but its a novel approach to aide in lubricating the chain . I wouldnt be worried about aeration of the oil any more than what the chain itself does .
Mainly, with every stop and oil slosh forward it sorta acts as seawall..also concentrating the oil at the crank gear/chain as it drags up.
Theres plenty of oil to the chain and that why I dont drill and plumb for extra oil to it.