Seems to use the Mastodon API though.
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of “federation” and “universe”. It is a common, informal name for a federation of social network servers whose main purpose is microblogging, the sharing of short, public messages.
Getting started on Fediverse;
This seems to be relying heavily on the mastodon markup and prolly won’t work with other fediverse software.
EDIT: After looking more closely I realize all the markup was the author’s own markup, not the mastodon markup. As the author is using the Masto API, this should work with any software that implements that API. I still think this is not a good solution because it prioritizes mastodon over the rest of the fediverse. Comments from some people will be displayed, but not those of people using other software.