Unless the GA castle doctrine is very different from the various castle doctrine laws I've looked at, it equals no such thing.
Castle doctrine laws provide the presumption of innocence if the criteria are met. It doesn't mean you're automatically justified, it just means that you don't have to prove you're innocent as you would normally have to do after shooting someone. It means that the state has to presume you're innocent unless there is evidence to suggest otherwise. If you provide that evidence or provide good reason for the responding LEOs to suspect that it wasn't self-defense or that you broke other laws, then castle doctrine won't mean much at all.
And it provides absolutely no protection against the penalties associated with other laws. So if you break another law (say tampering with evidence at the scene of a felony crime) the castle doctrine won't help you in the least.