In a small bowl, whisk together the brown sugar, paprika, garlic powder, onion powder, salt, pepper, cumin, and cayenne.
Coat the cubed pork evenly with the spice mixture and set it aside for a few minutes.
In a medium bowl, whisk together the apple cider vinegar, one cup of the barbecue sauce, the hot pepper sauce, and one cup of the broth.
Set your Instant Pot to the Saute setting. Add the olive oil and wait for it to shimmer.
Work in batches to brown half of the pork cubes at a time, searing for about five minutes until golden on all sides. Remove the meat to a plate.
Turn off the Instant Pot. Pour in the remaining 1/4 cup of broth and use a wooden spoon to scrape all the brown bits off the bottom.
Return the meat to the pot and pour the barbecue sauce mixture over the top.
Secure the lid and set the valve to Sealing. Cook on Manual High Pressure for 40 minutes.
When the timer goes off, allow the pressure to release naturally for 10 minutes before switching to Quick Release.
Remove the meat to a large bowl and shred it using two forks. Stir in the remaining cup of barbecue sauce and serve warm.