"Deanonymization" doesn't have to refer to a full exact address. There are people who wish to conceal which country or region they live in, which this cripples.

There was a real example of that amount of information being relevant in the Silk Road investigation. Ulbricht accidentally revealed his timezone early on, which was useful to US authorities since it narrowed him down to being in the US, whereas without that information he could have been from anywhere in the world.