It takes a few readings but he makes a valid point.
5 is where the flaps should be for conventional straight and level flight. Accept it, it's modelled correctly and that's how the jet is. 0 is when you're going mach 0.fast Probably due to stress as much as anything.
The GR7/9 has an emergency manual retract which forces the flaps up against their stops, 0. But it's for emergencies, as the name suggests.