In the video you can see the vehicle slows down dramatically to a crawl when it enters the temple.
I also think it's going to have like 3 mins of load/unload timed in. The closest vehicles in size are Energy's (each holds 99 people theoretically) and that gives 3 mins to both load and unload. Multiples of 30/90 tend to be used for load times. So if you have 3 mins split into two 90's you have 1 loading, 1 unloading, one waiting or returning, and two actively in the track for the five. That puts the capacity at a much more typical 1440 per hour.
Or maybe they'd go 1min for each to get 2160 which is an entirely typical hourly capacity level (things above 2000 are usually considered excessive - the park would need to jump up near Epcot DisneySea or Magic Kingdom in attendance to justify it.)