Is that on kbin? Or is that from Lemmy? Kbin isn't 4 years old AFAIK.

That's dessalines - the main dev of Lemmy.
The post is not from kbin (hover your cursor above the link you've marked red in your screenie and you'll see it's not "local" community).

He is not an anarchist. He is a known tankie.

See
https://kbin.social/m/[email protected]/t/47012/-/comment/196579
https://mstdn.social/@feditips/106835057054633379
https://raddle.me/f/lobby/96713/heads-up-the-tankie-behind-lemmy-ml-got-banned-from-r
https://raddle.me/f/TankiesGonnaTank/89852/the-lemmy-ml-admin-is-banning-anyone-that-mentions-stalin-or

It was a post on [email protected] by user [email protected].

Federation makes it visible to kbin.social.

https://kbin.social/m/[email protected]/t/40758/Us-vs-Them#comments

https://kbin.social/u/@[email protected]

EDIT: I'd also add that dessalines is one of the Lemmy devs, so was probably a test post.

https://en.wikipedia.org/wiki/Lemmy_(software)

Lemmy software was created by the user Dessalines on GitHub in February 2019[6] and licensed under the Affero General Public License.

Okay, I guess I'm not as smart as I thought I was, but it has "anarchism" in the magazine name, and it didn't see anarchism as just havoc.