There’s also a bit more context in a footnote on the first post:
“Some content in the series is drawn/adapted from content that I’ve posted previously on LessWrong and the EA Forum, though not on my website or substack. My aim with those earlier posts was to get fast, rough versions of my thinking out there on the early side; here I’m aiming to revise, shorten, and reconsider. And some of the content in the series is wholly new.”
“The content here is rough. I’m hoping, later, to revise it, along with some other work (including some of the future posts just mentioned), into something more polished and cohesive. But for various reasons, I wanted to get it out there on the earlier side.”
There’s also a bit more context in a footnote on the first post:
See also this flag at the beginning of the series you linked to: