It looks like the discrepancy (in upper/lowercase, at least) between the base-only case and the multiple-sets case has existed since this was introduced in 2014. The base-only command has been updated to correct paths and typos. The multiple set command has been updated with the removal of certain sets (e.g. games), but the incorrect path and case has remained all along.
Fix the path and case, and also drop <replaceable> from around sets, which is a variable name not replaceable text.