I designed an extension with a roughly similar aim that filters based upon various phrases and characteristics rather than the poster of the comments themselves. It collapses comments (via automatic triggering of HN's built-in collapsing feature) and adds a "reason" tag to the comment information, so I can choose whether or not to read it anyways. I feel the features with the most positive differences are the capitalization detector (hides all caps or all lowercase) and the character requirement.