It means he can play the game of hockey within the rules. The rules say you can make body checks. The rules say you cannot fight. There is no penalty for giving a body check. There is a penalty for fighting.
Fighting is technically an unwanted behavior within the game. Body checking is not.
If you play hockey you should expect to get hit, sometimes very hard. And if it's clean, the guy who made the check shouldn't be forced to fight, metal plates or not.
not the game I like to watch