It was a post on anarchism@lemmy.ml by user dessalines@lemmy.ml.

Federation makes it visible to kbin.social.

https://kbin.social/m/anarchism@lemmy.ml/t/40758/Us-vs-Them#comments

https://kbin.social/u/@dessalines@lemmy.ml

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.