I have just updated this script in devel. One of the monkey-patched functions wasn't doing anything!
That's all to the good. The faulty function was supposed to simplify the top-level summary diff nodes, but that's going to far. The summary diff nodes show the actual diffs, which would be important if there were a real problem. Otoh, the child nodes only show diffs not involving comments, and the script makes those diffs easy to check.
In other words, the script is a useful balance between completeness and conciseness.
Edward