I'll try to keep my reply short.
I read a lot of the conversation here every day and I've read a lot of the statements from the current leadership of YCombinator. And I think it's a gross attempt to undermine the discussion by asserting that I must not read anything because I could only be so wrong if that were true.
While I understand your comment that HN is a diverse site, and you are very correct there, I am not trying to make all of HN my opponent in this debate. I'm very plainly, although maybe I did poorly, hoping to make an opponent of a specific -- and in my opinion very common -- mindset on HN. With the goal of deconstructing it and ideally maybe even dismantling it.
To that end, I don't agree at all the YC leadership is doing a meaningful job of actually addressing sustainability via their practices as a business. I have read the words that you're referring to, which IMO are aimed at discussing sustainability. However, their practices are in direct opposition to those ideas. The startups they fund, the businesses they push to IPOs, and the monologues that they write on their blogs are far-more-often-than-not geared toward one goal: making money and expanding YC and the reach of tech related businesses, IMO without much regard for the impact it has on the world. I recognize that this is an opinion, and you pretty obviously aren't sympathetic to it, but it's fairly empirical in terms of substantive projects that YC has pushed hardest financially/philosophically. It's also empirical in terms of the replies on major posts, particularly the entrepreneurial ones.
And because you've implied this is off topic on a post about lichess, I should also clarify: I see the goals and accomplishments of lichess to be worth even more when juxtaposed against these YC culture. Especially knowing that someone like ornicar faced a very real choice when deciding to pursue lichess as his primary endeavor. I think he deserves to be applauded not only on his own, but also in that context. I also think it's no coincidence he is from France. Les français sont beaucoup plus à l'aise dans l'idéalisme, il me semble.... surtout par rapport aux américains. Mais pourtant ça sert aussi à créer son propre ensemble de "problèmes uniquement français"