Nothing easier than that: Art 130 StGB

Anyone who, in a manner likely to disturb the public peace,
1.
incites hatred against a national, racial, religious or ethnic group, against sections of the population or against an individual because of their membership of a designated group or a section of the population, incites violence or arbitrary measures, or
2.
attacks the human dignity of others by insulting, maliciously denigrating or slandering a designated group, parts of the population or an individual because of their membership of a designated group or part of the population,

The Post was in A Manner to disturb the public by being a public post. It attacks the human dignity by dehumanising a group based on their world view. Under current German law this is incitement to people.

Not that directly, but saying they have "zero worth" might be against GG Article 1

Human dignity is inviolable

Pretty sure dehumanizing can be prosecuted under this, even if its rather tame. Also there have been some laws over the last few years that criminalize violent speech on the internet and that give people the ability to report comments directly to agencies. These might make it quite dangerous for the instance to keep up these comments.

I assure you, German leftist often say way more intense stuff on a daily basis, but not on publicly hosted servers

And you sound like someone who is very quick to jump to conclusions without the full context.
They remove all hate speech, including any from actual nazi’s.
I don’t see how that makes anyone involved a nazi.

I can see where he was coming

A three day ban is now apparently Nazi. This word has truly lost all meaning. You are lost ideologically.

I only meant to say that changing another mod decision would only be taken, after discussion with them, if there's a clear and robust disagreement (a permanent ban). This, to me, is just a lack of agreement (a temporal ban).

I can see where he was coming

A three day ban is now apparently Nazi. This word has truly lost all meaning. You are lost ideologically.

cockroaches

You are using literal Nazi rhetoric. You have no moral standing.

I believe the death penalty is immoral because I don't believe there is such a thing as an act so heinous that it would be moral to kill them after the fact.

There is room in my moral framework for killing in self defense or defense of others, but I leave that to require some kind of immediacy. And I think enemy combatants in a hot war are fair game, too, but that requires a hot war as a precondition, and I don't think we're there right now.