No, they bring it up to temperature once per day. This is common practice around the world and quite safe.
Every time they heat the pot, it sterilizes it. It takes bacteria a significant time to recolonize a sterile pot, and it starts from a sterile state. As long as you re-sterilize (re-heat) it regularly, the bacteria won't have to time to colonize it in a meaningful way.
The downsides of this practice are not safety but the texture of the food, since repeated heating over many days tends to break it down into mush. On the other hand, it is well-known to improve the flavor of some dishes.
Every time they heat the pot, it sterilizes it. It takes bacteria a significant time to recolonize a sterile pot, and it starts from a sterile state. As long as you re-sterilize (re-heat) it regularly, the bacteria won't have to time to colonize it in a meaningful way.
The downsides of this practice are not safety but the texture of the food, since repeated heating over many days tends to break it down into mush. On the other hand, it is well-known to improve the flavor of some dishes.