I've got a bit more knowledge of the narrative here so I'll explain. Luminous, the admin who said kill all Zionists, has voluntarily resigned as an admin in order to try and get anarchist.nexus refederated. But the prevailing sentiment on anarchist.nexus and its sibling instance is that Luminous did nothing wrong.
Personally, as an anarchist, I think we should only be killing Zionist soldiers, not the civilians. So I'm very concerned by this apparent support for what would likely amount to war crimes. Zionism is bad, but I don't support the death penalty for being a zionist.
Now if you look at the history of Gaza, it gets even worse. Netanyahu funded Hamas in the most recent Gazan election to help them win, because they were more radical and violent than the other parties. Netanyahu wanted Gaza to be governed by people who think killing all Zionists is okay. So I think that Luminous is playing into Israel's hands, and giving them the propaganda they want. Is defederation an appropriate way to keep this propaganda from spreading? Unclear, I'm still on the fence. But I'm definitely not on Luminous' side in all this.