When in doubt, read the edit in the context of the question!
Note how the asker edited her question shortly after asking it, shortening all those long class and variable names down to things like "abc" and "ABC"?
The suggested edit did the same thing to the answer. So far as I can tell, it was a perfectly appropriate edit, preserving the intent of the answerer while removing the confusion introduced by the edit to the question.
On a more general note, there's nothing inherently wrong with editing code to make it easier to read (whether by reformatting whitespace, adding comments, or simply renaming variables). When evaluating an edit, try to determine if it actually improves the post - don't look for hard and fast rules by which you can accept or reject without thought.