Thanks for the input. It is likely this boils down to personal preference. The main purpose of labeling is to reduce the overhead of expanding items and keep key points organized; indeed, the goal is to get everyone to focus on some of the key issues and dissect them if needed. This also aligns with most of the scientific writing, where citations are labeled.
One way that might help is to first go through these labeled key points, then do another read. Having these common key points in mind also helps us to build common conversations and common grounds.
In this particular case, G0 is not referred to in the text, so the reference is likely about something generic. But if you want to discuss any of the points, or any labeled points are less clear, feel free to bring it up so we can expand them further in the post.