Yes but there is an external factor involved here: leaving the door open for extended periods of time. If we’re talking about energy saving for the battery, and you can probably extend that to the environmental effects as well, at some point it’s more cost effective to turn the A/C off. I’m not gonna argue if 30 seconds is that point, people who know more can confirm that.
Now obviously what they are NOT taking into account is driver comfort and the fact they are literally being timed down to the second with their deliveries to the point they leave the door open just to shave off a couple of seconds on each stop.