It depends why the hooker is in the team. It's significant that EVERY HOOKER IN THE NRL besides the four mentioned makes the baseline 0.5 tackles per minute. Some, like Friend and Kritchard, make a lot more than that.
It's not that King isn't 'making too many tackles' - he isn't making enough, just like Hodgson, Luke and Levi. But unlike Hodgson and Luke, who are key attacking players for their teams (as indicated by their stats) King is more like Levi - only in the team because there is nobody better available.