Without knowing what the original tutorial definition looks like I cannot say where you are going wrong, but I can make a guess. As Grasshopper has evolved the data management has changed so that what might have been a correct tutorial from a version 12 months ago might not work as intended now.

to achieve the desired result I would create Vectors from two points 1) your origin and 2) the list of grid points. I would then plug the PlanarSrf component into a Move component with the list of Vectors 2Pt.

Generally speaking, to use vector component to define the direction and distance based on which the unit will be relocated/copied in certain array. In this case, the component vector2PT will establish the relation between origin of unit and array points.