HN goes through phases, which I rather like. This way, we get semi-in-depth coverage of topics serially instead of always uniformly dividing our attention among all interesting projects at the same time.
Nimrod's turn is coming soon. And it is well-deserving. It has already had some pre-HN-darling attention here, which is what brought it to my attention. I'm very intrigued by it. http://nimrod-lang.org/
I don't really see the problem with this. A lot of the languages you mention have been slowly and sustainably building support, even when they aren't on the front page of HN.
It makes sense. We hear about a language, take an initially skeptical approach to it, research it, try it out, and report our findings to others we think might be interested (i.e. HN).
It seems like in the last week it just started popping up on HN every couple days.