Id say it means there needs to be another way to browse the site, where an old story can be bumped, with a new comment section, but inherits the old link, with the old comments available, and old score data visible. You can see how many upvotes it got each time it came about.
I really wish there were an easier way to list top stories for a specific period --- month or year would be good. Algolia does have a date-range-picker, but like many, it's cumbersome. It also generates date specifiers based on Unix timestamps (seconds since 1970-1-1). So here's the Best of 2012: