Think about it. BO7 is a spiritual successor to BO2 right? Just like Ashes is a Tranzit successor, Paradox was originally meant to be the Nuketown successor to release alongside Ashes at launch, just like Nuketown was with Tranzit. Then we would have gotten our typical 4 DLC season with Astra as our DLC1 and so on. But somewhere along the way, their plans had to change and couldn't have the map ready for launch or they knew the gap between Astra and the next mainline map would be large, so they slotted in as DLC2 instead.