First, welcome to the blog!
That's news to me as we just got back from that same cruise in Oct. They offered two different shuttles. One to and from Nova del Trochetto to the port in Ravenna and the other one to and from the Marco Polo Airport. I can't believe that they would have stopped the airport shuttle, unless there wasn't the demand for that one, assuming most people come in a day ahead. Maybe they didn't understand your question? Seems pretty straight forward to me. I would try calling RC again and see if you get the same answer. It wouldn't be the first time that two different customer service agents gave two different answers.
Happy Cruising!