They are special zombies. Just because they aren't controlled by a virus, doesn't make them not zombies. And since you didn't play RE 4 that long, what gave you the right to judge it didn't have zombies? Some regular zombies appear later on in the game.
Because if it was a real RE game and had real zombies I wouldn't have stopped playing it so soon
Bet Shiken that COD would outsell Battlefield in 2018. http://gamrconnect.vgchartz.com/post.php?id=8749702