Henry's total body count, which stands at more than 489 million. Warhorse Studios put that number into a fun and historically appropriate perspective: "Henry is worse than the Black Plague when it comes to killing."
The Black Plague, one of the most infamous pandemics in human history, is estimated to have killed as many as 50 million people over a roughly seven year period. So yeah, Henry is way out in front on that one.
That is what is meant in the title.
Article statistics are actually just fun stats on what players do as Henry. "Sobering statistics" implies there is something depressing or bad for the game but the article only reports success for KC2. Misleading article title, unless it is actually just being tongue-in-cheek and I missed that.