Building on this, I really wouldn't want an IRC channel for pretty much any of the GitHub repositories we have. We already have budgie-desktop-dev for Budgie development and given I'm the main developer of it and do it on Solus, even I don't really make much use of it and arguably it has little to no value. I could probably delete it and make it invite-only tomorrow and nobody would notice. Dedicated IRC channels / Gitter rooms for anything in the GetSolus org would be overkill, introduce unnecessary noise and additional undesired moderation workloads.
Building on that, our primary development platform is Phabricator, not GitHub, so having something which caters to GitHub isn't something I'd want. #Solus-Dev is sufficient for development needs and even that is mostly just used by Core Team, Global Maintainers, and some individuals that want feedback on patches or help with packaging. If people wanted to engage enough in realtime, we already have a channel they can utilize.
We've also already expanded on what sort of communications platforms we would support in conjunction with IRC, e.g. Riot + our own Matrix server, should they meet certain criteria. They don't yet and thus they're not supported.
