The comment about the role of PR was to get some feedback (https://github.com/kamailio/kamailio/pull/2606#issuecomment-768336527), I am expecting this means to discuss and get to some conclusions the developer is looking for and acknowledge the next steps.
I assume your `Close this PR, as discussed in previous comments` refers to his remark the he would agree to close the PR, but no real discussion was in between.