Hey there @GCAdventure
In a rear punt like that, more often than not the one doing the punting gets front wing damage and the one being rear ended gets damage to the diffuser. Unfortunately the latter isn't repairable in real life.
Even the rear wing isn't repairable in real life, in the unlikely scenario that's the component being damaged. Teams will simply retire the car.
That's often not fair, but that's also part of racing.
I could see it being repairable in a casual mode, but on realistic performance or unassisted lobbies I'd rather the game keep it on par with the real thing.