PyPI Stats filters out downloads from mirrors (such as bandersnatch) in an attempt to better reflect end-user downloads:
Looking at lockfile’s relative position, those 10m downloads put it in the top 300, so it’s clearly important to the community:
One option to encourage people stop using it: if you’re still in a position to release, emit a DeprecationWarning on import suggesting the replacements. Or something noisier like a UserWarning.