Canceling his posts is stupid and certainly completely exaggerated.
This is not an objective fact but an opinion (whether well-substantiated or not I cannot tell). I am not clicking on a Facebook link to learn more, so thank you for adding some additional context here.
There is also a !yepowertrippinbastards@lemmy.dbzer0.com community that will certainly agree with you that anything done by a .world community moderator is by definition wrong.
As for myself I have no opinion on this currently, but only questions like banning one person does not make a place authoritarian/fascist but a pattern of such events would. All that this post says though is a complaint about the one person - again, whether justified or not I have no idea, as other commenters here are likewise saying, we simply do not currently have the facts to be able to judge properly.