We've banned this account for repeatedly breaking the site guidelines and ignoring our requests to stop.

Please don't create accounts to do that with.

https://news.ycombinator.com/newsguidelines.html

What specific guideline did these comments break?

I believe that you censoring in support of defamation (knowingly false claims an ethical statement is incitement) may incur liability for HN. Incitement has a specific legal meaning (which this is not).

You seem to be directly supporting defamation on your platform, as an administrator.

The personal attacks in your GP comment, for example, broke the guidelines egregiously. That should be obvious!

If you want specific examples you could start with "Be kind" and "Assume good faith".