Like any religion, what "is" and "isn't" a member is a bit ambiguous. The Watchtower says there are around 7 million publishers. A fair portion of these are unbaptised. And of those there is some percentage that doesn't really have a grasp on JW theology.
There are also people who are not publishers or who are inactive but still identify as JWs because they occasionally go to meetings or are studying. Their answers too will influence the stats.
Lastly, there are publishers, baptised ones, ministerial servants, elders, pioneers, etc who are trapped in the religion but no longer believe everything the WT teaches.
We don't just get to cherry pick the JWs who are toeing the party line and say "only their responses matter". We have to look at the whole picture of what it means to be a JW in various states and transitions.