This article doesn't discuss why the organization in question didn't just self-host their own fediverse presence, perhaps using a CMS plugin like one available for WordPress. I'm not familiar at all with this "InfoSec Handbook" group but what I'd like to see at some point is a software platform that allows organizations to spin up fedi presences at their own domain (Write.as does this, but it'd be nice to have other players in the ecosystem), or even if traditional SaaS vendors would just adopt the underlying W3C protocols to allow for that.
yeah I thought that was the point of it. Sounds like the article authors don't get the Fediverse, and use it interchangeably with Mastodon. It's like saying Linux sucks because it's so complicated, having only tried one distro (i.e. Arch)
With the ActivityPub plugin (this one to be specific: https://wordpress.org/plugins/activitypub/), your WordPress site implements the underlying ActivityPub protocols and becomes an Actor that can be subscribed to by other ActivityPub installations.
Other CMS plugins may be worth looking into, or it may be worth looking into having your favorite CMS implement these protocols directly.