The restriction iirc is mentioned from time to time since

https://news.ycombinator.com/item?id=47340079 [thread id]

https://news.ycombinator.com/item?id=47346735 [dang mentions there is a restriction]

You've only had an account for under an hour, and 20 of it was spent crafting your post?

I'd expect the intent is to help cut down on some of the wave of drive by Show HN posts by requiring folks engage with the site for a bit first and get a feel for the expectations.

Post the link as a non-Show HN post?