It's a natural impulse but somewhat counterintuitively
https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
One way to think of it is as repetition-prevention since a big enough story is going to end up on the front page one way or the other.
Moreover, I'm not affiliated with Citus and I don't know if they are planning later on an official announcement or not.
I stand by the idea of sharing these good news at the earliest for everyone interested to know, look at the code, and plan ahead of time if they need/want to.
the idea of sharing these good news at the earliest
isn't really HN's remit, despite the 'news' in the name. The actual announcement is going to get posted as well and dupe-debated, etc. So there's no harm in waiting.
But it appears you didn't consider the following part of my comment, where I explained that a) I didn't have any way to know there would be a later announcement; and b) that there's enough interesting information with the current news that is worthwhile to many (definitely was for me), so there's no reason for holding it.
I didn't have any way to know
I mean, they weren't going to keep it secret. Anyway, let's wrap up here.