I have found that to be true, myself. In fact, after starting the HCl, I began to have salt 'cravings'. I wanted more salt on my food. Within a couple of days of pouring on the Sea Salt , I began seeing improvements in my digestion. It's funny, it is almost like taking the HCl told my stomach what it needed to do to improve. My digestion of meals that I didn't use HCl for was better. I'm sure that controlling my SIBO overgrowth contributed as well, but I am certainly feeling better.
Have you read 'Your Body's Many Cries for Water'? It also addresses the importance of salt and water to digestion. More info at the Water Cure forum.