The loin doesn't have to be thawed. Just dump it, two cups of tap-hot water, and the BTB if using (try 1 tsp of BTB next time we do this, see if we can't make it even MORE yummy), and then sprinkle the taco seasoning packet over top. Set the Instant Pot for HIGH pressure for 40 minutes, with a 10-minute reminder and Keep Warm for after, then let her rip! Once it's done, fish out the roast from the liquid, shred, and devour. Consider weighing the meat before and after because we are honestly curious how much mass it loses!