I too am gobsmacked, that in this day and age Airbus have managed to design another generation of machine that doesn't do what you could reasonably& logically expect.
That's not how the system works. Yipoyan is confusing an autopilot trimming against a pilot induced control input with the normal FBW response. If the crew here had pushed on the stick with sufficient authority, at any speed, the trim would move nose down to match that response.