"intensively discussed" would for the most part indicate that the item is of some interest or importance to the people discussing.

I think it would only indicate hype if it were also true that most of the discussion was disingenuous in some way. The distinction underlying this thought is that discussion is not (usually) promotion or deliberate publicizing of the thing discussed. Usually, it's just plain, honest discussion.

Hype has almost universally negative connotations to me. Based on the name, I expected your extension would hide "hyped" stories (where hype is perhaps defined by a high comment-to-upvote ratio for a story), since hype is usually bad. You may wish to consider a new name.

Not really "sorted by sum of comments and votes" nor really "age is ignored". The former only affects horizontal offset of the start of a title, and the latter is preserved, so that the order (and fluctuation) of the titles is as usual too.