Yea I messaged Cattle Decapitation on Facebook and here was their response:
Me: Any chance on joinin the Atlanta show?
Cattle Decapitation: we tried dude. Already had something booked apparently and I didn't even know... all the dates just got put up. Sorry man, we really want to come back to ATL!
So sadly no Atlanta date even though they play with Fetus the day before and the day after. Sucks