From what I can tell they call it a soc in a box. They have a wiki on how you are supposed to build it (on proxmox). Here is a link to their architecture diagram for it.
https://gitlab.com/kalilinux/kali-purple/documentation/-/raw...
It is intended mostly for training purposes. I think it looks pretty neat for a start. We'll see where the community takes it over the next couple of years.
