I agree, too much salt is bad.Anything with too much salt. Chickens get poisoned from salt easily if fed too much of it
This is just plain wrong. Some salt IS found in what chickens normally eat. Go read the label on any bag of chicken food. Or read articles about the bad things that happen when chickens do not get enough salt.since salt is not regularly found in what they normally eat.
Here is an example from the University of Maine Cooperative Extension:
https://extension.umaine.edu/livestock/poultry/nutrition-for-chickens/
Just like people, chickens need the RIGHT AMOUNT of salt. Not none. Not too much.
And if you do not feed your chickens a commercially-produced chicken feed, go look up the nutritional information for the things they do eat. Small amounts of salt are present in many things.