The news is that they've been able to reliably fingerprint you by using nothing more than basic WWW callbacks: things basically needed, say, for formatting purposes (visited links, too-large or too-small elements, etc.) or things break. Basically, the metadata needed to make the WWW work smoothly and efficiently is ALSO, inherently, extremely valuable de-anonymizing information. It's like the return address you put on an envelope. Put it on, and people can find out about you whether you like it or not, but if you don't, and things go wrong, there's no way to backtrack and do a Return to Sender or the like.
The TL;DR version: if you want to do practical business anywhere, you're going to have to leave traces in case of problems, but those traces can be used against you. The price of society, basically.