At the end of that article they give an honorable mention to Battle Royale. Without a hint of sarcasm, the author wrote
The Japanese made a lot of changes to The Hunger Games when it came to their country. The cast was switched around, the premise was slightly tweaked, and the name was changed to “Battle Royale.”
There’s even Battle Royale books and manga too! Who knew the Japanese loved The Hunger Games that much?
How’d that get passed editing? Battle Royale is a Japanese book/movie that came it around 1999/2000, while the Hunger Games was 2008. If anything, Hunger Games copied Battle Royale.