Don't forget the ending: Brandenburg's incitements to non-imminent violence were upheld as legal. And the person recording/distributing the incitements (the cincinnati reporters [ i.e. Kiwifarms in this case]) was not charged at all.
It sounds like Kiwifarms is inciting imminent violence that will likely occur.
Are you sure the incitement that provoked this response wasn't someone illegally (and against ToS) using the services of Kiwifarms, rather than the owners and operator of kiwifarms? It's my understanding Kiwifarms removed the Belfast post quite quickly. Indeed imgur is still hosting the image of the post, shall imgur also be charged?
Posting someone's address can obviously facilitate a swatting. In some cases, it might even make someone an accomplice to one. But just recklessly posting someone's address doesn't make one an accomplice.
There's no implied request for someone to SWAT or even harass the person. I get that this provides no comfort to the victims, but this isn't Brandenburg incitement.
In all likelihood this appears to be what is happening with kiwi farms. Of course, the issue is that Cloudflare can’t undertake legal enforcement, but they have a terms of use and so contractually are duly within their rights to end service to kiwifarms.