Far from accurate. The price of solar power in the Middle East is record low, on the order of 1 cent per kilowatt-hour.
Cheap human labour from impoverished parts of Asia and Africa is one very possible option. The supply chains are already there.
I personally know a few people from villages in South India, who had been trained in that kinda job - dressing up in heat-controlled suits, driving sand-buggies and operating large-scale-wipers and cleaners - to keep panels clean. A similar one is in India too. And some of those firms put in place a locally adapted solution - which involves a lot of wastage of resources of other kinds (water, manpower).
More info: https://spectrum.ieee.org/energy/renewables/the-pros-and-con...