The units do contain fusion drives its just that the link between the SATA and the NVMe is split when they loaded the system.  You have to use a terminal command diskutil resetFusion to recombine the drives and then reload the system.Anyone who knows these computers knows that a SATA is the biggest mistake apple made in these computers.  With a Fusion or an SSD, these are really nice computers.  With a SATA, they hang constantly.