More likely the panels are there because it would cost ten fortunes and a zillion forms and permits to get electricity out there. I don't think he's all that worried about losing power because he has back up plans.
You are right.
I am not a prepper, think it is dumb. I do live simply, think that is a smart strategy.
I have 3 photovoltaic panels, have had them since the early 1980’s. Only use them for unusual circumstances to power radio transmitters.
We also have 2 gasoline welder/power plants. We use them often at the farm.