Why don't QubesOS recommend libreboot?

For example, this page mentions coreboot but does not mention about libreboot.

But one of the community recommended computers, X230, supports libreboot.

What is the reason?
Can someone familiar with this please tell me why?

libreboot is nothing but coreboot.
At one time libreboot stood for something distinct - it included only
free software. If you wanted coreboot images that included only free
software, libreboot provided them.
The developer has chosen to muddy the waters, by using “libreboot” to
cover both coreboot images that include non-free elements and
coreboot images that do not. i think this is deliberately misleading and
false advertising.

I never presume to speak for the Qubes team. When I comment in the Forum or in the mailing lists I speak for myself.

I was worried that QubesOS would not work with libreboot.
Now I can safely install libreboot on my Qubes laptop.