Abbreviated public subscriber counts are gradually rolling out starting next week. We heard a lot of feedback from the community following our announcement in May – we’ve updated our original post with more info here → https://yt.be/help/LF4J
Splitting "active subscribers" stats (those who have viewed a channel video in, say, last 6 months) versus total subscribers would indicate the vast fake dormant subscriber counts and enable you to purge the system.