This is a post written by David Thorstad, a philosophy professor who maintains a blog for criticizing various tenets of effective altruism called Reflective Altruism, as part of a series of on human biodiversity (HBD), a modern iteration of so-called race science. HBD, of course, isn't typical fare for EA, or any of its championed causes. Yet it has, to much controversy over the years, been recognized as a subject of interest among prominent thinkers associated with either the effective altruism or rationality communities, or others writers they've been affiliated with. This latest post in Thorstad's series provides a critical overview of @Scott Alexander's history of engagement with said body of ideas, both on his current blog, Astral Codex Ten (ACX), as well as before then, such as on his previous blog, Slate Star Codex (SSC).
Small note (while not endorsing the NGO), I struggle to see how "Project Prevention" could be considered a "slide into open Eugenics" just because they wanted to move into Haiti. Are EA Family planning organisations similar because they want to work in Africa? Of course not.
From wikipedia looking at their clientelle "As of May 2022, out of 7,833 clients it had paid: 4,791 (61.3%) were white; 1,626 (20.8%) black; 830 (10.6%) Hispanic; 572 (7.3%) other." which seems like a fairly representative mix among the people groups they work with.
The founder has been interviewed on Radiolab and the guardian has written a fairly reasonable article on it (ages ago) which was fairly even handed while mentioning that her work has been "compared with Nazi Eugenics".
I agree with your comment about Scott's support for the org, but I think he unnecessarily sullies and misrepresents the org along the way. Why not just explain what the org does and then tell about Alexander's response to it, as the focus is on Alexander.
Like your say regardless of what you think about the orgs methods, they aren't an org which has eugenic intentions and shouldn't be tarred by that brush in the article.
Again to say I probably don't agree with what the org does, but have a lot of compassion for her founder because she has genuinely given much of her life towards looking after children others don't want, and this org came out of trying to solve that issue.