LMAO, I live in Florida...
After about 10 seconds, my car at least starts to cool down considerably. More comfortable than an enclosed box without A/C will be (even with ventilation and forced exterior airflow).
I did not make such a comparison, at least not with the same framing you're claiming I did.
The gondolas will have some sort of forced air ventilation, so they WILL be cooler than a car that is off and has been sitting in the sun for hours. But they still won't be comfortable on 85+ degree days (which is most of the year for central Florida).
My comparison was a car after it has been turned on with the air conditioning starting to circulate for about 10 seconds. At that point, my car begins to quickly cool down and is more comfortable than these gondolas will be.
80 degrees is nothing. It is currently 91 degrees where I live (roughly 15 miles from WDW). High today is supposed to be 95. We're not at the peak yet either. Humidity and heat index can also get hellish.