I was thinking that myself; renderings aren't always entirely accurate. Plans can change, also.Is it possible that that animation is just there to showcase the ride experience? And isn't necessarily accurate regarding number of boats?
Given the focus of that video is on the ride itself, it doesn't seem necessary for them to have to include it in the animation really
Even if it doesn't have a turntable, I'm sure they could still dispatch a train every 2 minutes or so, which would give a theoretical throughput of around 720pph, which is the same as the Free Spins. If those cope on an average day, this definitely well.