Yes, but that 8.4M websites is out of a universe of ~375 million websites - so it's a very small percentage (I am using the number of sites that BuiltWith tracks, which probably isn't all websites, but it's a minimum number). The pages number is meaningless, because sites that use it will use it on every page they have - if I have a site with 2 million auto-generated pages, then I account for 2 million of those web pages.