CSL DD (8 Nm) availability errors?

Hello, I just ordered my first direct drive, used the bundle configurator and picked the CSL DD (8 Nm) I also included a screenshot from it. After finishing all up, checked the cart and the DD base was removed from my cart so went ahead and added it again and then the only option I had was the other option for 499.95 that stated that its only for pre-order and available from aug 28, can anyone explain that to me and does that mean I will have to wait till the 28th? Thanks!