First, you might have to restart Couatl to have the "Estimate Passenger number" option being read. However, this is not really the issue. Regardless if GSX asked the number of passengers or not, you can see it HAS calculated a number (17).
However, I cannot see any passenger bus in your video. Passengers requires a bus to be seen so, if that parking has the bus disabled in the customization page, you won't see any passengers.