This seems almost uselessly simple to me. The “cognitive overhead” of a list of notes feels trivial considering this is a person who managed to put their words online.
The issue isn’t cognitive overhead, it’s not having rituals to review and refine your thoughts. Everyone has to jot down ideas from time to time, but if you never take time to stop, review, and organize your thoughts then sure it’ll feel like a lot of cognitive overhead.
The person is also quite good at specifically putting their words online in a way that others can benefit from them. (Enough so that it’s a bit of a running joke[1] when he quits his job and has time to write some more words.) That skill is generally difficult to transmit, so if they’re saying something in that direction it could be worth listening.
The issue isn’t cognitive overhead, it’s not having rituals to review and refine your thoughts. Everyone has to jot down ideas from time to time, but if you never take time to stop, review, and organize your thoughts then sure it’ll feel like a lot of cognitive overhead.