Off-topic but that URL is remarkably repetitive. Is that some kind of SEO play?

No, its an effect of autobuilding from a git repo, I think.

The specs are submitted for review at https://github.com/openstack/openstack-specs

Repo called openstack-specs sitting in the openstack namespace. Inside that repo is a folder called specs.

https://github.com/openstack/openstack-specs/tree/master/spe...

Who's the author? I can't find it in the document.

Yup that's me.

https://lwn.net/Articles/662140/ is where this also was written up.