It looks like you're specifically asking about the HTTP Archive CWV Tech Report.
This is a combination of the origins that have sufficient public traffic to be included in CrUX and also that were crawlable by the monthly HTTP Archive.
You can see the list of sites detected using each technology here:
SELECT DISTINCT
root_page,
rank
FROM
`httparchive.crawl.requests`
WHERE
date = '2025-07-01' AND
url LIKE '%web-vitals%' AND
(root_page LIKE '%.gov.%' OR root_page LIKE '%.gov/%')
ORDER BY
rank,
root_page
Thanks,
Barry