"One sidestick at the forward stop and the other at the rearward stop equates to both neutral sticks regardless of the force (pressure/torque) applied, does it not? "
Yes, that's correct. I don't think the example using control columns is quite correct but I know what the poster is getting at. In the example, the CC would move in the direction of the greater force and the airplane would respond according to the extent of the movement which would, in the example, continue until the CC hit the stops (commanding full-up control deflection), while in the Airbus the SS movement (in degrees) is algebraically summed and the output to the flight controls is that sum. In the case where the sticks are at full deflection but in the opposing directions, the output commanded is neutral and no control deflection occurs.
The fact that the other pilot cannot know what input is being made and therefore cannot make correct assessments as to aircraft handling is the reason why dual inputs are prohibited. The correct procedure is to press the takeover button which temporarily locks out the other sidestick. Keeping the button pressed for (IIRC) 45 seconds locks out the other sidestick until landing.