There are two Orlando Premium outlets locations,the shuttle leaves from the Vineland ave location which is the one closest to Disney.The suggestions to take a bus to DTD and then grab a taxi to the outlets was probably to save some on the cab fare since it's not much more than a 5-10 minute drive from DTD to the Vineland outlets,you simply take Buena Vista dr to Hotel Plaza blvd. turn right on 535,go under the I-4 overpass,get on the left lane and turn left on Vineland which will take you directly to the outlets.Obviously if your hotel is somewhat close to DTD then yeah there's no reason to take a bus to DTD to save a buck or two,but if you're staying at the Animal Kingdom lodge which is a good distance away,it might be worth the savings.