Well, I've read the whole linked Issue and only then understood that it's not in fact CJDNS[1]. The latest commit there is Aug, 6, which is very frustrating. I'd love to see HN crowd paying more attention to such projects.
And also, note that yeah they last pushed to master in August, but they've been doing work since then on at least one other branch. https://github.com/cjdelisle/cjdns/tree/crashey
Software should mature and when it does, development should slow down. I don't use cjdns myself, but from what I've heard it seems to be a solid piece of software.
If you had personally submitted a PR to the project and it was sitting there unacknowledged, or you were seeing lots of PRs by others sitting unresponded to then I could see a reason for being frustrated. But there are only two open PRs at the moment, and only one of them is without any comments.
CJDNS - DNS software for ip6, by "CJ"
IOW, totally unrelated.