Exactly. Adding a comment for every edit is pretty spamish and looks ugly when there are multiple edits, like in the linked example. It should be exactly like on forums (also meaning that if you edit a bug report before X amount of time has passed since you posted it, no 'edited' mark is added at all).
If keeping track of each edit's date is somehow important, that could be added to a special log not cluttering up the main page, which could even be for moderators only. Though what the automatic comments were added for might be so edits show up in the "Last activity" column, but if they can't work it around so edits show there without showing as comments on the page, they might as well not include edits there and use an alternative.