Gentoo and CentOS discontinued? RHEL source

So I was researching the “minimum templates” that Qubes supports (after having reality hit me that my hard disk still isn’t big enough lol), and I am wondering about the announcements from RHEL (Red Hat) said both of these are now discontinued as in not supported. Does that mean the Qubes team is taking over the support for the VM version or no? I am just wondering why an unsupported distro that has been deprecated would be suggested in the user manual info I read through — unless the VMs will be issued patches by Qubes team or something???

I am confused about this

Are both CentOS and GenToo really discontinued forever ever???