That's for the whole assembly, obviously. If you were designing for swaps, the BMS and other active components would remain in place and only smaller packs of cells would be swapped. That also addresses the equally specious "don't want to swap out a critical component that's half my car's value" argument.

If we can do it with scooters today, I bet you we can do it with cars, just need some stronger mechanical arms and whatnot.