The
same data from the same source show that his former teammate Derek Forbort is even slightly better at limiting zone entries. You probably won't hear a whole lot of praise coming from Kings fans about Forbort's defensive game. Also, notice that it tracks only 61 games out of a total of 206 that Muzzin has played in the last three seasons. I think that it's better to watch the games to see how well the players perform in certain situations than to rely very heavily on those kinds of unverifiable "hero" graphs.
BTW, to be clear, I'm not saying that he's bad at limiting zone entries, even to the naked eye. It's probably safe to say that he's good at it, but all of that standing up at the blue line also allows attackers to walk around him when he fails and get very dangerous scoring chances, which such data doesn't show you.