Prepare the ribs by removing the silverskin (see instructions in post above).
Rub the dry rub into the ribs on both sides.
Pour the water and apple cider vinegar into the pot of the Instant Pot.
Place your trivet in the pot and the place your ribs on top of the trivet. The ribs should curl into the pot with the meat side facing out so that it presses against the inside of the pot.
Lock the lid in place and turn the valve to SEALING. Set to HIGH pressure for 25 minutes.
When the timer goes off let it do a full natural release (when the pin drops on top you know it is done).
While it is naturally releasing preheat your oven broiler.
When the natural release has finished unlock the lid and remove your ribs, placing them on a baking sheet.
Brush your BBQ sauce over the top of your ribs and then place in the oven for 10 minutes. This will caramelize your sauce.