Preheat the Instant Pot on High Saute. Saute bacon until crisp. Scoop the bacon out and set aside. Drain most of the fat out of the pot (all but about 2 tablespoons.)
Add the sausage, onion, garlic, salt, pepper, and crushed red pepper. Saute until the sausage is about all the way cooked and the onion is translucent (5-8 minutes.)
While sautéing, slice the potatoes in half lengthwise, then again into quarters (as if you were slicing long steak fries that were 1/4 of the potato). Slice into thin triangles and add to the pot.
Add 1 cup of the chicken broth to deglaze the pan. Scrape the cooked bits off the bottom of the pan into the liquid thoroughly. The soup will burn if not properly deglazed. Add the rest of the chicken broth.
Lock the lid, turn the knob to Sealing, and cook on manual high pressure for 1 minute.
Wash and strip the kale off the thick stems, roll up in a big bundle, and slice into thin ribbons about 1/4 inch. This is called a chiffonade. Break up any large pieces. Massage the kale with you hands for a minute to soften it up.
When the pot beeps and it has completed pressure cooking, carefully release the pressure in short bursts. If you just flip the knob to venting, soup can spew out everywhere through the venting knob, so be careful and do it in bursts at first. After most of the pressure is out, you can flip the knob straight to venting to release the rest of the pressure. It will take a couple minutes for it to fully release pressure.
If you use hot sausage, there will be a red film on top of the soup. You may skim it off if you like. Set the pot to Saute again. Add the bacon and kale. Push the kale into the broth so it is covered. Be careful not to stir too much, or else the potatoes will break up. Simmer until the kale is wilted and cooked through, just 5 minutes or so.
Add heavy cream. Taste the broth, and add additional salt and pepper. Enjoy!