There is no need to suspect conspiracy theories.

It’s not possible for a moderator to delete a post without it showing up in the modlog. Admins with direct access to the filesystem and databases could theoretically do that, but that’s unheard of for any well run and organized instances.

More likely, you didn’t post it to Lemmy World, but to a community on some other instance and it was removed by mods of that other instance community for cause.

Lemmy.ml also has a big and popular world news community, I checked their modlog, and sure enough there are two recent posts of yours removed from c/WorldNews@Lemmy.ml. They were removed for violating the community rule of posting links to articles that are more than two weeks old.

lemmy.ml/modlog?page=1&actionType=ModRemovePo…