OP called out PRs and comments, not just code. I’m not familiar with this project, but there’s a lot of stuff required for projects that isn’t coding but still shows up in GitHub’s activity. Even basic stuff like doing demos and updating customer stuff shows up as updates to the web site and notes on presentations and stuff.

Unless someone’s job is just sending email and talking on the phone, I’d expect some visibility. Not for tracking purposes, but for community engagement since it’s the best way to clarify requests, produce roadmap info, etc.