This caution is also noted throughout the procedures anytime all the pressure is released. I don't know if it'* possible to damage these shocks without residual pressure or not. Thought I'd pass it along though.
Before driving the vehicle, turn the ignition on and wait approximately 45 seconds. This will permit the ELC system to execute the air replenishment cycle (ARC), ensuring that the air adjustable shock absorbers are filled with residual pressure.