It really isnt either. The chicken is actually cooked in a tandori first and then served with the sauce. I thought it was cooked in a similar way as curry, which is a braise.
Stock. The amount of stock is what makes a soup a soup. Sauces are not soups. Stews are not soups. Gumbos not soups.
I see these things over and over. I can't make myself think to hard about creating concrete categories out of what are just continuums, soup to stew, sandwich to stromboli, action to christmas movies etc. The internet seems to stress over it, and ranking things.
I've said it a million time if I've said it once: cook your chili in a pot, cook your beans in another pot, if you want to mix them later then go for it.
Soups/Stews might be the GOAT food for Taste-Health combination. Plenty fresh veggies that barely need chewing plus you've kept all vitamins lost from cooking in the juices. Go extra healthy by soaking your meats in water to remove some cholesterol. The key after that is keeping the sodium low. I've avoided many trips to fast food establishments by having a cooked stew. Tastes *even better* after 3-4 days in the fridge. There are better tasting foods, there are healthier foods... but Stew is the GOAT combo. It has no weakness.