Perhaps not objectively, but PRs will often be reviewed during performance review season. So seeing someone at 10x less than someone else is a major red flag, as long as the quality of PRs is roughly equal.
This hits even closer home to me because I am about to get evaluated this Monday and my PR performance has been pretty sub-par in the last 3-4 weeks -- I've been put in a project that has been abandoned for like 3 years and only recently picked up again and 90% of what I do is documenting and taking notes and creating GitHub issues; coding is sadly still a low priority activity because there's still chaos.
But you know what? I don't care anymore. Let them fire me if they use broken metrics. I am doing my work very diligently and I am making sure the project will be in a better shape after me. If they can't appreciate that then I am not bothered by such people viewing me negatively. They are in the wrong, not me.
If, on the other hand, you were on a "smooth sailing" project, and didn't have any code delivered in the last month, that would be a red flag to me, which we would need to talk about.