I've never heard of them, let alone tried them.
But a quick Google says:
"When I was a kid, I worked at a KFC and for a short time we had "BBQ Ribs" on the menu. There was nothing BBQ about them, of course; they were pork spareribs, dredged in the Original Recipe KFC flour seasoning mix and deep-fried in the pressure fryers for 20 min, then dipped in BBQ sauce and baked. They were actually quite good if not authentic in any way."
And the basting sauce:
KFC's secret recipe A basting sauce like no other! Great for roasts, spare ribs, steak, chicken etc.
Ingredients
2 1/2 cups water
1/4 cup vinegar
1 tablespoon sugar
3 teaspoons pepper
3 tablespoons olive oil
3 teaspoons salt
1/4 cup Chopped onion
1 clove garlic, minced
1 teaspoon red pepper
2 teaspoons chili powder
1 teaspoon hot pepper sauce
1 teaspoon Dry mustard powder
3 tablespoons worcestershire sauce
How to make it
Combine all ingredients in a saucepan and mix well. Bring to a boil, stirring constantly. Reduce heat and simmer for 5 minutes. Cool overnight, warm before using. Start basting meat with this at the beginning of the cooking process.
So you'd have to cook ribs as normal - assuming you haven't got a suitable oil pressure-cooker - then coat with KFC chicken mix, deep fry till done and roll 'em around in the sauce that you'd have made by now and finish them off in the oven.
Sounds rather good to be honest but I've got another rib recipe lined up before I try these.