That is really, really f'ing annoying, and it's the scientific equivalent of click bait. The phenomenon described in this article seems largely unrelated to greenhouse gas-induced climate change, and instead appears to be more directly related to just more underground heat sources being constructed.
Confusing these two different phenomena does nobody any good, and my suspicion is that scientists would use the term "underground climate change" because "Hey, above ground climate change gets a lot of press, if I call this 'underground climate change' maybe I can get some better press too."