Salted butter vs unsalted butter

Hi! I’m a beginner baker and majority of the time when I bake cookies (or anything really) the recipe calls for unsalted butter. This recipe is calling for salted butter instead of unsalted butter. I was hoping somebody could look at these ingredients and let me know if I should go ahead and use salted butter like the recipe says. I thought the user made a mistake by putting salted butter, but she confirmed and said yes, salted butter. I do see that she didn’t add salt to the recipe. Could this be why ?because she used salted butter instead of unsalted?