Meaning, for example, the tweet that links to this article? [1] Doesn't look like they have a current mailing list other than notifications from...the forum this article was posted in. If they wanted to market Gradel to HN (rather than simply spread the word that they have a new release to the intersection of the two communities), they'd presumably use, you know, marketing material. After deciding that they're doing X, complaining that they didn't do even the most obvious thing required to succeed at X is a pretty good sign that they weren't trying to do X in the first place. "Your post is the worst attempt to write a novel I've ever seen!"

[1] https://twitter.com/Gradleware/status/48388354498154496