Please, look at the context.
You're right, there was no body found but everything short of the body suggests it was used for burial.
No body was found in Menkaure's pyramid either. Nor Khafre's. Nor Unas, nor Sekhemkhet's, nor Khaba's, nor Huni's, nor Djedefre's, nor Userkef's, nor Sahure's, nor Neferirkare Kakai's, nor Neuserre Izi's, nor Djedkare Isesi's. So why is the lack of a body in the GP such a big deal?
Because you want it to be, perhaps?