That's still a Jedi-Sith head count. It's a balance of Force-users, not the balance of the Force. One usage of the term "balance" is not automatically equivalent to any other kind of "balance" that can be construed. The Sith are not the dark side. Defeating the Sith does not mean the Force is "all good". That would just make every Force user a dark Jedi and wouldn't have anything to do with promoting the balance of the Force. It's the balance of the Force, not the balance of individuals, or their Force use.