I assume it is essentially more about if it includes the author of the article. In the specific case, the author is a journalist not a scientist part of the actual group that did the work, so their "we" seems to forcingly include everybody in the planet, thus also OP here. I dont think OP would have an issue if one of the scientists in this case used "we".

Ah good shout, I was assuming the author of the article was also on the team of the discovery, but it's Gizmodo, so I shouldn't have thought that.