Quoting you!It only operates when the vehicle is in neutral (don’t quote me on that part).

“The 10-speed Heavy Duty Automatic features Ford’s pioneering Live-Drive Power Takeoff which allows customer to operate accessories when the engine is running, whether the vehicle is in motion or stopped. This is a critical option for equipment that requires power on the move, such as snowplows, and dump trucks.”
https://www.ford-trucks.com/articles/2020-ford-f-series-super-duty-power-takeoff-output/
I think that’s a new thing, though, and traditionally pickup truck PTO only worked while stationary.