Lemmy.ml is more broadly federated than sh.itjust.works, its users get exposed to more broad viewpoints and a more complete vision of the broader Lemmy. Its admins and a large portion of moderators and users may be Marxists, but it's less of an echo chamber than instances that align with western consensus and ban dissent against that consensus.

Most users on Lemmy.ml can't escape the liberal viewpoint even if they tried as hard as they could, while most users on the more liberal instances can comfortably live their lives without ever engaging with Marxism.

I also have no idea why you expect this article to be downvoted because it's on Lemmy.ml, genuinely.