How exactly "can" they? They've been trying pretty hard for quite a long while now and nothing has ever worked. It's also pretty logical why they can't: they don't control your device, you can do anything with it. Whatever they implement, you can always fake being a normal user. Which is exactly why no one using Firefox + uBlock sees anything of what's mentioned in this article (as long as no other addons/settings trigger the adblock detection).
Only the environment they do control is affected, which is essentially like "controlling your device": Chrome.