Then wouldn't a sudden rain storm or washing the car in the heat cause the same issue? How many cars go thru car washes and don't come out etched? I respect research, but I also respectfully disagree with that finding.
Faulty or incomplete conclusion, IMO.
Disagree all you want. But there is no sudden blocking of the sun in 1 small spot if the entire car is getting rained on or water sprayed on it. And the water would cool the panel down where a dime size bird carp would have no affect on the overall panel temp. Find the study and read it before you question their conclusions.