i can assure you people still make duck confit, the real way, as my step dad does in his restaurant, and we did where i interned.
I Think it's weird when people say they confit onions or tomatoes, how cany ou do that? there isn't any fat (and for sure not enough fat) to cook those in its own fat. from what i've seen and done, onion 'confit' is just sweated onions, and tomato confit is just baked tomatoes with oil on it.
and once again, 'real aioli' is just mayo with olive oil (in my experience, again, you make mayo with canola or veg oil) and garlic added. then you have all the derivatives, like with stocks and all the mother sauces.. the possibilities are really endless.