If you put the bag full of air it will pop because of conditions and qualities appearing in this process. The same body has physical limitations and the pain will be felt but suffering on the basis of this pain will be nonexistent for Arahant as you would not develop anything unwholesome on the basis of any experience so there will be no suffering.
If what you said would be true there will be not possible to attain Nibbana. The leftover suffering after attainment of Nibbana is only physical so feeling the pain and not create suffering on the basis of that pain are two different things.
For example, if somebody hit you, you do not like the pain can be gone but you can still think and suffer thru many days or even months. The is no doubt that the leftover suffering is there and will be there and can be minimized by lifestyle choices (not always) but I would say this pain is something else than a feeling of suffering which is eradicated at that point and not appearing.