>> I am not a regular CPython developer, so I don't have a good way to assess which reviewers speak for the project and which reviewers are only offering a personal opinion.

In this webpage (bpo) core developers have a little python logo close to their name (as myself).

In GitHub, you can sometimes tell by hovering over the profile or checking the core dev log in the devguide: https://devguide.python.org/developers/