Combine the coleslaw mix, cider vinegar, 1/2 teaspoon salt and several grinds of black pepper in a medium bowl. Cover with plastic wrap and refrigerate until ready to serve.
Combine the jackfruit with the chili powder and 1/2 teaspoon each salt and pepper in a large bowl. Heat 2 tablespoons oil in a large skillet over medium high heat until shimmering. Add the jackfruit and cook, tossing occasionally, until the spices are fragrant 2 to 3 minutes.
Add the barbecue sauce to the skillet along with 3 cups water, stir, cover and reduce the heat to low. Cook, stirring occasionally, until tender, 45 to 50 minutes. Uncover the skillet, turn the heat to high and simmer until the color has deepened and the sauce is thick, 4 to 5 minutes. Remove from the heat.
Using a potato masher or wooden spoon, smash the jackfruit until it resembles a pulled pork consistency and season to taste with salt, pepper and light brown sugar if you would like it sweeter. Serve on the potato buns topped with the coleslaw.
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