Isn't it simply that submission titles for old articles (usually) include the year in parentheses?

eg: - https://news.ycombinator.com/item?id=44379606

- https://news.ycombinator.com/item?id=44379688

- https://news.ycombinator.com/item?id=44382003

Perhaps the fact that it's been 11 years and systemd works pretty well?