Not only does it manually disable text selection, it also disables the right click menu and most ways of opening the dev tools... for some reason... (you can still reach dev tools using the top right menu on chrome though)

Using "Find" in my browser says those words are on the page somewhere but I cannot find them anywhere.

Weird. It's the last sentence in TFA.

I think it actually slipped under the ad. Using a browser with Adblock I see it.