That's hardly the attrition i learned about. If WW1 worked like that, the battles and casualties would probably have ended up strikingly different.
I wondered about his question too but waited to see if anyone else would take a crack at it.
Attrition just means wearing something down. So there might be no right or wrong here. Though the common meaning I've encountered is indeed wiping out everything the enemy has.
If you destroy all the enemies vehicles, they have no vehicles.
If you kill all the crews, then those vehicles will just sit there.
If you destroy the fuel supply, then those vehicles will just sit there.
If you destory the ammo supply, then they'll be able to move but be little better than a gun with no bullets in it.
If you destroy the food supply, then those vehicles will just sit there after the soldiers die or are too weak to operate them.
It's still all the same, wear them down so you still have something and they don't, whether it's soldiers, vehicles, fuel, ammo, food...