That information is intentionally left out

It's on the second paragraph, titled "Target".

> Developed and tested on AMD Family 16h CPUs, the last generation whose datasheets document the DRAM controller's translation registers

While security by obscurity isn't recommended, in this case it sounds like it's still a huge hurdle.

Yes, a hurdle to effective security research. Something hidden only appears to have no vulnerabilities. By raising the bar on a mass market product of this sort you ensure that in the event well funded actors develop exploits in secret they won't be inadvertently discovered by the public.