This is a barebones skill with minimal documentation and no SKILL.md file, so you're working blind on what it actually does. From the repository stats (123 installs, 12 stars), it seems to have light usage. If you need Claude to help with product management tasks like writing PRDs, prioritizing features, or running user story workshops, this might be worth a shot, but you'll be experimenting without much guidance. The lotosbin repository appears to be a collection of skills rather than a focused project. I'd probably look for a more documented alternative unless you're comfortable diving into the code to see what prompts and behaviors are included.
npx skills add https://github.com/lotosbin/claude-skills --skill product-manager