Xbox Series X Sales Are Trailing Both Xbox One And 360

That would be the Xbox Series sales as a whole, not just the Series X. If we consider the latter in isolation, based on those leaked documents, it should be trailing behind the Dreamcast, Wii U, and PS Vita, let alone the much more successful Xbox 360 and Xbox One.

And it’s also what the original source claims: “Xbox Series trails Xbox One by 13% and remains slightly behind Xbox 360”. So I would suggest for the article to be corrected.