Old reviews like that are no longer removed, and they have not been removed for months. Those are from when I was first made an admin. My job, as I was told, was primarily to remove "unsupported" ratingss. As the majority of reviews happened in the past, I assumed all unsupported reviews were fair game - after all, previous sweeps for bad reviews made in the past HAVE been made.
Trafton later noticed this. Despite general approval of removing the unsupported ratings on his part, he advised the removal of ratings prior to my appointment as Admin should cease, because if any single review from then was left unmoderated, it would show biasedness. And it has ceased. While there is no real way to find out what the ratings were on the long-ago unsupported reviews, you can rest assured no more old reviews will have their ratings removed without warning.
It remains true that rating something a long distance away from the average rating requires a longer review than one close to the average. But you STILL NEED TO BACK IT UP. These are the J2O RULES, which remain posted nowhere, but eventually we may be able to get them visible. Really, it only takes about twenty minutes to create even a very short acceptable review. If your rating gets removed, it is primarily YOUR FAULT.
In summary, yes, that happened. It was an accident. It will not happen again.

~Unknown Rabbit aka Violet CLM (in case this post didn't make sense to you)