From the photo, one of two things happened. A run on the chargers while there was no power outage. People didn't navigate to the Supercharger so there was no preconditioning which caused the Superchargers to go into cold battery mode (the distance to the Supercharger might have been so short that it wouldn't make a lot of difference. I've noticed on trips that the first Supercharge in the morning the preconditioning a -3 C doesn't complete by the time I've driven four miles to the Supercharger. Assuming they are locals and don't have home charging, they should pre-warm the car before driving to the Supercharger.). Or a combination. This appears to be a driver education issue because Tesla can't change the physics of battery charging.
Minor nitpick on the underlined section: Superchargers don't. It's the car that knows the pack temp, SOC, charge profile, etc... and commands the supercharger.
In this instance the car knows the pack temp, and only asks the supercharger for what it wants to pre-heat the pack (although I saw an early report for the Model 3 that said it didn't ask the charger for anything while pre-heating, but I'd hope that would be corrected by now to at least let the supercharger supply the few KW needed for pack heating...).