As I don't have a Fusion Drive to experiment on, I cannot test or otherwise verify this, but Fusion Drives are virtual entities somewhat along the lines of APFS volumes. I believe that in order to run a Surface Scan you would have to address only the HD portion of the drive.
That thought crossed my mind immediately upon learning that the command didn't run on ryck's fusion drive, but
"diskutil list" shows it as one seamless unit, and with "disk1" already having returned an error, I don't see another number in the readout that looks even remotely like what we may be looking for.
And then again, the command's running on a freestanding SSD but not the SSD portion of a fusion drive doesn't seem logical.
We may need some input from V1 to get to the bottom of this.
