It's certainly not dead. Unix workstations are still really popular for general purpose use. You can go in a local retail chain and buy an Open Group certified Unix 64-bit RISC workstation for £639 here (Argos)...
https://www.argos.co.uk/product/8802877?clickSR=slp:term:app...
I'm not really trying to call you out, I just don't think any of the Open Group certified Unix versions was ever licensed for the consumer market. I would need to see hard evidence to be proven wrong about that.
Certification of the OS: https://www.opengroup.org/openbrand/certificates/1217p.pdf which is linked on the page you posted.
It's a proper Unix machine. Costs slightly more than a nickel :)