Playground
Without prefetch
There is nothing to measure here: you did not reach this page through a click, but for example by reloading it or opening an address. Go back to the article and choose one of the buttons in the playground.
Your browser had already fetched this page while the pointer rested on the button. After your click the HTML was ready, so there was nothing left to wait for.
This link has a query string, which our rules skip. Your browser only started on the page after your click, so you waited for the server.