new wiki chapter created just now:
Most likely because these instructions are generic, for many Linux distributions. As the article is saying, quote:
Some distributions may be using libvirtd.
In other words, the instructions are and not specifically for Debian (based) distributions. And that is OK. That is not to criticize the article generally. This style of generic instruction can be useful for system administrators and developers. See also Linux From Scratch.
Debian (if the packages are installed) by default has a
libvirt linux user group.
Therefore also for example command
sudo groupadd --system libvirt isn’t needed.
For users it will be difficult to contextualize it. Therefore…
…isn’t the right question. Would be rather, are these steps required in Whonix documentation? And then more generally, would these steps be required in Debian? Does Debian, Kicksecure (which Whonix is based on) or Whonix do this already?
If you’re an auditor, you’re welcome to scrutinize all of this but it requires being a very advanced user (being able to contextualize the applicability of instructions Linux from scratch, Debian, Kicksecure, Whonix) to avoid flooding support with too many questions because this is a tiny pick. Thousands of similar questions could be asked.
Therefore https://www.whonix.org/wiki/Reporting_Bugs#Support_Request_Policy applies.
I am not a maintainer of Whonix KVM.