> I would be interested to know how they define web resources.

They explain things in the FAQ. You're supposed to do a "Cloudflare URL Scan" and read the "Total bytes". For HN this is 47kB [1], which, yes, is just the 6 requests needed for / and nothing more.

[1] https://radar.cloudflare.com/scan/4c2b759c-b690-44f0-b108-b9...