Stroking a path is done with a brush tip (brush or pencil mode) following a path (pen tool) and is quite different than a stroking an object (like with a layer style). The terminology is confusing, I agree. What he did was make a custom brush tip that consisted of a line and a dot. Then he laid out a path with the pen tool, then he set the spacing for the brush tip to 586%, then he stroked the path with the brush tip. A layer style of stroke would give you a solid line or a pattern or a gradient.