if it moves with the suspension it moves with the shape of the road not the car and it is unsprung weight

the only parts of the shock that are sprung and move with the chassis are the top hats, rods and valving. even the spring's weight sits on the suspension arms and is unsprung weight in a tipical car but is moved to the chassis in this set up.

your sub frame is attached directly to the chassis, there are no dynamic forces between the two, its is most definitely sprung weight and would be considered one component with the chassis for any suspension calculations