CoD-wise, it was CoD 5, World at War. Only back then the reason for lack of gore was the Wii was too weak to render it. If somebody tried, they'll say Switch is too weak to render WWII (or if it can render it, then they'll say it's too weak to render the gore). Generally, Final Fantasy has been censored on Nintendo consoles (only back then FF didn't become a AAA juggernaut until 7). Early Castlevania games were censored on Nintendo platforms (IV was hit the worst on SNES). Doom 1 and 2 got censored on the Game Boy with some blood colors being removed/changed from red. GTA 1 and 2 got censored on Game Boy Color.
On Nintendo's side they themselves censored Ganondorf's blood in OoT's later versions because they wanted avoid a T rating (E10 didn't exist yet).