I hope they didn`t use the rod in place of the egc.I`ve been seeing some spas done with no neutral ran to the spa box just 6/2 with ground. Now the million dollar question.With the little neutral isolated the gfci is useless. If you use the ground wire or bond it to the ground bar its a viotation but safer for the homeowner because they`ll never agree to rewire the spa with the incurred cost.Or do you mention it if they wont rewire just leave it?