The salts issue was actually mentioned in a follow up video [0], with the note that only homes with specific water types (excessively hard water if I remember correctly) will require them.
I’ve lived in places with hard water and most people have a water softener right next to their water heater so that all water to all appliances in the house is softened.
Every dishwasher I’ve had in Europe has a salt compartment. I can’t remember the ones I had in the US to have a salt compartment. I’d wager the powder and pods in the US have some salt in them to make up for that?