What do you mean "this way". What other way is there to run the site?
That's not absent from the article, it's right there in the section titled "The Claude ratio". ChatGPT, Claude, etc. use different user-agents for scraping vs user-initiated requests, and the author notes that user-initiated requests were an absolutely miniscule fraction of the total traffic.
Yeah, googling it does seem like "Claude-User" is for user-initiated requests.
By "Claude sent me" I thought the author meant referer header in real browser requests showed that they came from.
I mean, that's what the section "Pages crawled per visitor referred" refers to, right?