I don’t think so. It looks like docs.nextcloudpi.com is hosted on a different server.
It also looks like the actual content of docs.nextcloudpi.com is hosted here in the Nextcloud forums, and the script that is supposed to fetch and categorize the content is somehow broken, respectively it cannot access the content anymore. Maybe due to an update of Discourse? (the forum software used here)
Nevertheless, all the contents of docs.nextcloudpi.com should also be available here: NextcloudPi Documentation - Nextcloud community