This is propaganda. It is intended to make you think worse of ground mounted solar, the carpark side is to make the message palatable, but isn't comparable. But solar farms in fields is the cheapest way of deploying massive solar plants

Carpark solar is limited to the power infrastructure at the carpark, the limit for commerical building solar in my town is 30kW, the solar farm nearest me (on a sheep field) is 13MW

Commercial buildings get to choose: solar on the roof or solar over the cars. Putting it over the cars will more than double the cost.

So this is, or acts as, propoganda, saying "this effective thing is bad, instead we should do this impossible thing"

Oh, to be clear, I don’t think carport solar arrays are fossil fuel propaganda. They’re a useful application where they fit. It’s the idea that solar on fields is harmful that I object to, and I worry that carport solar is being presented without the full context as a red herring, so folks like us who want more solar start objecting to utility-scale ground mount.

And cover from rain also.

Saying it's unreasonable is too far, fair to disagree with it though... Fossil fuel is always happy to push clean energy projects that wouldn't work well at scale to sabotage things. Though personally I'd say calling this out as car propoganda is more important...