Yep, that is a fact. No matter what any other CM tells you, you are not guaranteed an adjoining room, unless you are the only adult on the trip. Otherwise they figure you can split up and one adult be in a room, and one adult in the other.
Disney does try to accomodate this request, but you need to figure out how you would deal if you do end up in 2 seperate rooms. Would it make your trip miserable, or would it be doable? If you simply cannot stand the thought of being in rooms that do not connect, you should make different plans.