Because they’re prefabbed walk-in coolers or freezers (at minimum, they could be purpose built cold storage warehouses) with multiple condensers, evaporators, pumps, temperature sensors, and humidity sensors. The refrigeration equipment needs some sort of control system and direct digital control is the usual way to do that these days.
This is food storage for a commissary, aka a store. They don’t use residential refrigerators.
Do regular grocery stores use a similar system? Or are locally controlled, simpler systems?
I've noticed stores going to central coolant lines going to cold cases more and more lately. Its all still industrial control. Ideally.