Oh, that's what "Anthropic's search crawler, had requested 420,680 pages in one week. That same week, Claude sent me 12 human visitors" meant?

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?