The camber bolt that mounts only the Aft link / back control arm to the sub frame is mounted reverse. That means that in an ideal situation the battery pack needs to be removed to slide out the bolt and remove the old control arm.
However, because it is recommended that you replace the camber bolt when replacing the control arms you can cut this bolt with an angle grinder so you do not have to remove the battery.
The new bolt can be inserted from the front side of the car towards the battery. You will then have the nut at the side of the battery. No need to remove the battery, the result is a reversed bolt. Next time the exchange of new control arms will be even easier.
(Tesla advises to have the bolts face away from the battery pack to minimize the risk of the bolt contacting / piercing the battery in case of an accident.)