I suspect the care put into the message was more to ensure that this specific example would look reasonable on its own. When set in the context of the site it's posted on, and the other sites associated with the author (e.g. fsfesicherheit's other postings to HN), it looks more like a pattern of quite targeted harassment.

I personally have no skin in this game, but if the message was censored from the list I would give the listmasters the benefit of the doubt that this was due to the author of the e-mail rather than the content per se.