Canned products have salt added to them as a preservative but you can remove the salt by rinsing the chicken under tap water once you open up the can.
There is salt added to any canned product whether it be canned peas, canned tuna, canned chicken etc.
I have used the kirkland canned chicken breast when travelling before. It doesn't taste that great but it's basically just cooked boneless skinless chicken breast. It's a good option when you don't have time to cook.