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).
Thiel and Sanders don't have much in common, but Scott has stuff in common with Thiel and Sanders. (I.e. he shares broadly pro-market views and skepticism of social justice and feminism with Thiel, and possibly pro HBD views, although I don't know what Thiel thinks about HBD, plus an interest in futurism and progress, and he shares redistributive and anti-blaming the poor for being poor economic views with Sanders.)