See 1e71cad6e4/maintainers/scripts/pluginupdate-py/pluginupdate.py (L487).
This line checks the plugin's name and normalizes it before checking with `to_update`.
`to_update` is a raw list of packages you want to update.
Thus, calling `vim-plugins-updater update "package-name"` filters `current_plugin_specs`, removing all `PluginDesc` with *normalized* names that do not match `to_update`
Hence, updating something like "mini.nvim" does not work as the filter expects normalized names. Using "mini-nvim" instead works as intended
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