I do think that the case of the person using a Nazi avatar on a forum is comparable. The former is something they are doing withing the community, DHH's behaviour is outside the community. Its not clear how much people should be sanctioned for holding unpleasant views.
The problem with the article is clear in this passage:
"Sometimes a political party or a person decides to oppose shared human values like the importance of care, kindness, inclusion, or the simple value of welcoming people who are different from you. Maybe they oppose the equality of all people. Maybe they think some people do not deserve human rights."
That very quickly becomes a subjective and partisan judgement. Its very easy to say everyone who votes for a different party is "opposed to equality", or that people who do not share you culture or language and vocabulary or vote for any other party are those you should not be nice to. Very often the inclusive becomes exclusive and even culturally imperialist. Foreigner who uses the wrong words because they do not have the same implications in their culture? Excluded. This is not made, but, but something I have seen people get angry about.