As I say on the link, you need either a real scsi disk, or, better an scsi emulator, like a SCSI2H https://store.inertialcomputing.com/SCSI2SD-s/100.htm, a RaSCSI https://www.tindie.com/products/landogriffin/rascsi-macintos..., a BlueSCSI https://gumroad.com/l/bluescsi-1b or a MacSD http://macsd.com/
The Mac(s) on the video have a SCSI2HD v5.5, with 4 2Gb partitions on a microsd. I can mount the first partition on my linux to copy stuff onto it (in general via the minivmac emulator).