I don't go outside anymore. So my 2 bob's worth is that a red colour is ok in ocean water if shallow. Rapalas generally are shallow divers so the red wouldn't have faded much at a shallow depth.
The white colour is probably the most under rated. I've caught most of my barra on white lures in the earlier days.
You'll see in that US Navy article that their divers found white to be the best all-round colour tested for visibility under all conditions.
My go-to lure for dirty water for barra is a red/green fluro shallow diver BUT the second choice is simply a white shallow diver or plastic (at a reasonable retrieve speed to keep it shallow).
You got any info on eyesight of mulloway or flathead etc?