I think link should be changed to https://w3techs.com/technologies/details/pl-php/all/all, because it points to more actual results. On that page, we can see a diagram that shows many websites has not been updated to work with latest PHP 7+, which I'd say is quite shameful and/or method used by authors of this report to check PHP version is not adequate (I guess it is now a common standard to hide version of the used interpreter in a HTTP header, while it wasn't obvious todo task when only 5.x was available). Additionally, I found it is quite wrong to putting equal mark between PHP and Hack (HHVM) in section of "Popular sites using PHP".
Edit: Fixed some language errors and typos.