On Thu, Dec 2, 2021, 8:08 AM Vincent Breton <emacs-orgmode@presentiel.fr>
wrote:

> Hi,
>
>
> Emacs and Emacs Org documentation, and lot of others GNU products use
> Texinfo to generate their own  documentation to different formats.


The Org mode documentation switched to Org format few years back:
https://git.savannah.gnu.org/cgit/emacs/org-mode.git/tree/doc/org-manual.org

Yes, originally, it was in Texinfo.