This is what I would like too. I want my repos to be public, but my contribution activity to be hidden.

Making the profile private doesn't hide your public repositories.

GitHub is now owned by Microsoft. Just saying.

GitHub was just as bad before Microsoft bought them; a proprietary software as a service vendor using venture capital funding to provide a loss leader that lured people away from running and using open source infrastructure.

https://mako.cc/writing/hill-free_tools.html