It doesn't strike me the same way, having read the notice. The connections at HND seem to be a limiting factor acknowledged by the airline itself:

"Because of restrictions on landing slots and flight times times for certain destinations much of the connecting flow via Haneda remains domestic-to-international rather than international-to-international. This does limit the volume of connecting passengers somewhat, though the total volume of passengers – roughly 70 million annually – means there is still plenty of feed to go around."