The person who changed the code, it's just ordinary maintenance. The comments may not execute, but I submit they are as much a part of the program as the executable code. Maybe over time those comments are condensed, or even removed; no different than any other refactoring or cleanup.
Snapmaker Luban is amazing with its help messages.
Every setting in this 3D slicer is completely explained how the setting works, what the different options are, with pictures and even what every option is the most optimal in whatever situation.
Too bad that it isn't the best program unless you have a Snapmaker, and even then...