While Valve will not be making and providing their own e-ink display for the Steam Machine, they have opened it up so anyone can now do it.
Quite literally the first sentence of the article. No, it has not. But there are now instructions to retrofit it with one.
Orygin@sh.itjust.works 2 days ago
They made a face panel with an e-ink display for their internal testing (display status, temps, speed etc). Said they would not sell it but they released how to make one yourself
Gladaed@feddit.org 2 days ago
That makes sense, thank you!