It was more straightforward than that from what I saw (I was there and witnessed this first hand)... His people called for doxxing and violence, the admin commented on it and review it and decided it was allowed on his timeline. THIS caused the outrage and he got a lot of shit... only after people started blocking him did he decide to remove the post.. but his server has remained radicalized regardless..
To be clear WE dont block them.. they block a **huge** portion of the fediverse and have isolated themselves as many of the extremist servers tend to do.