One exception may be Niklas Luhmann, a German sociologist, who was a prolific writer. His note taking method was part of his philosophical process, I assume.
But he's a great demonstration of Matuschak's point. Luhmnam wrote dozens of books about a wide range of topics, enabled by Zettelkasten, and then wrote a couple of essays towards the end of his career about how he did it.
Did he? I though we have his archive and we know how he used it (from some interview, I think). Didn't thought he wrote about it directly in his system. Do you have source on that?