Time zone has no info about where I actually am. Sure, I'm in a particular vertical slice of the earth. I have the JP keyboard downloaded, but you're wrong, that doesn't mean I speak Japanese. In fact, I speak French but your cookie reading didn't pick that up.
It is genuinely interesting what info gets passed to websites but the doomy tone is rather silly and will unnecessarily worry people who don't know much about computers/Internet, which is the majority of users.