Not so easy to design. The arms are huge so a rod up the center was probably there and insufficient.
Even a token lightning rod would be easy to spot, though. I’ve seen diagrams of the “cone of protection” furnished by a rod. What rods often do with their sharp pointed tips is attract and drain away the electrical corona leaders that spawn lightning strikes, before a full strike can form. The adage remains true that “if lightning wants to strike you it will.” The paths of lightning can be crazily chaotic. But usually rods will help a situation or at the least redirect most of an actual strike.
Why put the rods in the arms?? Mount'em on the nacelle behind the prop arms. They just have to extend up higher than the prop arm length, which shouldn't be too difficult.
If you run the rod through the nacelle center of rotation around the tower, it is a direct shot straight to ground.