I do agree that someone is trying to sell something.
Unless entire large acrage farms convert into solar, the distribution of retail, commercial refrigeration, high density housing (apartments), etc will notmeet daytime demand. Many businesses have installed some solar to offset their daytime energy use.
Most home solar installations are supplimental with only brief periods where the het pump cycles off durring the day that net metering even feeds into the grid.
In my area I have looked into the possibility of off grid, and it would require removal of the laundry pair for hand wash instead and an outside clothsline in all weather.
If I covered my entire roof, I would have to change my primary heating to something not dependant on electric. Yes I could possibly sell some daytime power to the utility for a couple of hours each day, but that small amount an more would be consumed by the supermarket down the street. The utility would never have a net surplus from consumers that is not used locally.