Nah, HFM has SPC cables before, those are the stiff ones packaged with HE500. These are supposedly quite different.
In the Hifiman press release, these cables are "Newly-designed cable of Crystalline metal featuring Oxygen-free copper and Oxygen-free silver" whatever that means.
In the DIY cable thread someone asked about a plusSounds wire:
It's the next to last on that page and ain't cheap. Their version is cryo-treated, so maybe it's different from HFM's, but the plusSounds is clearly differentiated from the SPC they offer. Too rich for my blood, but it is a curious construction.