Actually, when I was there in July, my nephew and I did the Trainer For A Day program. Our guides did refer to the tropical river as the "resort pool". I don't know why they used those terms instead of tropical river, but maybe because it is like a pool with clhorine instead of salt water like the reef.
That being said, it isn't like a resort pool, it's like a lazy river, part of it had a current and it goes through the aviary. Also, there are some parts that have no current and large areas for people to hang out/swim in. All in all, it's not very deep.
HTH,