When promoting files between pypi feeds, is the option to promote a single file actually supported?

The help documentation for the pgutil command "packages promote" provides the following example:

pgutil packages promote --feed=private-pypi --to-feed=public-pypi --package=Django --version=5.0.6 --filename=Django-5.0.6.tar.gz

However, when including the filename in a call, it responds that filename was an unexpected argument.