Late comment because I can't edit my post: I've discovered a serious defect with this rule—it incorrectly blocks old, archived HN threads which had 0 comments. That's because you can't write new comments on threads beyond a certain age, so this rule will apply to them if they don't already have comments. (Neither the string [discuss] nor [<N> comments] will appear—it doesn't default to "0 comments", it defaults to empty-string). This is an edge case that applies, for example, if you're browsing on Algolia search and are trying to click through to a submission's URL—that UX takes you into the empty HN thread first, which immediately hides the URL.

Leaving this warning for future archive delvers (hello there!)