I completely disagree. I used various newsreaders in the past and found google group to be the best tool to follow RAS. Too many advantages to list.
One of them is that spams are removed. In this example it may have been by mistake but normally it seem to work well. And if I recall correct, it is removed if enough viewers flagged it as spam, which is probably what happened. So I recommend to continue using google group. You can set it so you can see which posts are new since you last viewed it. And you don't need to download the messages to read them as is often the case with newsreaders.

Ramy