Empirically it might reduce flame wars on HN, but you need to take a long hard consideration as to why it causes flame wars on HN and not other sites. Because to me, that signifies a certain, non-small proportion of the userbase here is unable to handle topics involving race, and that section of the userbase is so virulent that even stories which do not proselytize are wrapped up into the flame war.
And to preempt the argument I already see forming: Yes, social media sites and HN are a reflection of society. But your duty as someone maintaining the site is to control what parts and in what ways it reflects society. It is an excuse. Not an argument. And I find erasing race from discussions because it might inflame racists to be particularly egregious. I can understand doing so if the poster did so in a way as to misrepresent the article, but this was not the case.
This is so evidently false that I'm inclined to think it's even contrary to what you suggest; "other sites" is far too ambiguous.
Your argument about this feels to me a bit like backseat driving. All of HN's problems in these areas are endemic to the category it belongs to: a large, public, optionally anonymous, completely open internet forum. Find one of those we can learn to do better from, and I'll be delighted to.
The sites I'm referring to are more or less microcosms. Larger subreddits, or sites like Tildes, SomethingAwful etc. These sites don't have the traffic of HN, but they deal with similar issues at their own scale. Larger sites can and absolutely should apply ideas learned at smaller scales and try to scale them upwards.
edit: Regardless of my thoughts on the site, I'll stop arguing about it and let things hopefully get back on topic.