Reposting is officially allowed:

> Are reposts ok?

> If a story has not had significant attention in the last year or so, a small number of reposts is ok. Otherwise we bury reposts as duplicates.

https://news.ycombinator.com/newsfaq.html

While we're on the subject of following site guidelines:

> Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something.

https://news.ycombinator.com/newsguidelines.html