Earlier quoted context omitted.
I believe the guy can say what he wants on his blog, and it's arrogant of you to think otherwise. And your notion that Hacker News users can't discuss what they want on their own site is crazed. My point, and I think his, is that the ever-narrowing topic definitions may be what the participating community wants, but it is driving off people with different ideas. If you're happy with that, fine. But insisting that out…
I never said the guy couldn't or shouldn't post on his blog about it, nor did I say it can't be discussed here on HN. If you want something to actually be done about what you perceive as a problem though, you need to join in the community discussion at the site set aside for that purpose. Decisions about SE policies are made by the communities on SE sites, not on HN.
If you guys are happy to lose users in that fashion, by all means keep asserting that the only way you'll listen is if people put the right cover on their TPS report and submit it to the proper forum.
Whether you like it or not, SE users and former users are going to keep on discussing SE policies where they please. You guys can learn from it and even engage with it. Or you can just keep defining it as illegitimate, putting your hands over your ears, and going "la la la".