I think there's a place for HR to help somebody give feedback about social or work-style issues. If somebody has a track record of getting defensive with face-to-face feedback it might be useful to have a manager present as a mediator and go through a formal process.
That's just not the same as giving scientific feedback in the review process for research and shouldn't be in the way there.
I think you're missing the massive point that someone thought that doing it in a non-anonymous way would have resulted in retribution. That is not defensive, it's offensive. You seem to be missing the fact that the woman seems quite happy to try and bury people over seemed transgressions.
Someone thought they HAD to goto HR to provide the feedback because no other way was safe. If you want to act about the scientifc review process, that should never happen and when it does there should be serious action taken.
That's just not the same as giving scientific feedback in the review process for research and shouldn't be in the way there.