Given other common things I've seen filtered, I wouldn't be surprised. I don't think the intent is to sensor as much as it is to keep the news a little more focussed. Still, I wish there was a bit a transparency with a viewable list of what is and isn't filtered.

Turn on showdead in your profile and you can see what is being killed.

But even that isn't the whole picture - for example this thread has over 100 points and has magically disappeared from the front page in only a few hours while topics with far fewer points stick around. So there must be an invisible gravity switch.