I don't understand how this methodology works. They claim "We investigate technologies of websites, not of individual web pages. If we find a technology on any

I don't understand how this methodology works. They claim "We investigate technologies of websites, not of individual web pages. If we find a technology on any of the pages, it is considered to be used by the website." So then how on earth do they arrive at the claim that only 1.5% of websites use 'static content'? I would be astounded to discover that 98.5% of sites are using a serverside rendering technology to deliver every single page on their site (let alone their CSS, javascript, images, favicons, robots.txt files...)