Place ribs in a gallon sized ziplock bag. Add salt and cola, and seal the bag, turning a few times to coat ribs. Refrigerate for 12–24 hours. Remove ribs from marinade.
Place wire trivet in Instant Pot® and add the water. Arrange ribs on the trivet, place lid on pot and lock into place to seal. Pressure Cook or Manual on High Pressure for 40 minutes. Allow pressure to release naturally for 10 minutes. Use Quick Pressure Release.
Preheat oven broiler.
Place ribs on a baking sheet and brush barbecue sauce over ribs, covering completely. Broil ribs at top of oven until the barbecue sauce begins to bubble, about 3 minutes. Turn ribs over and broil other side until sauce is bubbly and browned.