He's banned on HN for frequently being aggressive and using offensive language, especially the N-word (which may not mean the same thing to him as its historical meaning). Some on HN feel that banning for this reason effectively discriminates someone due to their mental illness. He sometimes posts good content and has valuable insights.
The argument against un-banning is that you can still read his posts if you have an HN account and turn showdead on. Terry is an esoteric personality, but many of us are aware of his work and enable showdead for this reason. The posts aren't entirely censored.
Obviously, only users browsing with "showdead" on would see and be able to interact with dead posts.
I suspect such a mechanism already exists, it just isn't public because the comment that inspired the poll (https://www.hackerneue.com/item?id=7817137) is now no longer dead.
Now what about this one :) : https://www.hackerneue.com/item?id=7819070
It's 'on topic', has a sense of humor and no profanity.
Or it may very well mean the same thing to him, which is the most obvious interpretation of his comments. His comments using the word are obviously using it in a negative way and many are clearly racial. He very well may not understand why it's wrong, but the meaning seems to be there.
Thanks dang.