The tag split is used for lots of things and not used consistently for anything.
It has been planned to make it go since 2014. Can we burn it now?
It's done. There are now zero questions tagged split.
The original content of this post follows.
The meta question you linked has the status-planned moderator tag, so we have the official go-ahead to make it vanish. You can help remove it from posts that have other issues (spelling, grammar); such edits will be approved if you improve the post significantly and mention the tag destruction in the edit comment.
Users with the edit privilege (>2K reputation) can and should clean up the rest.