Hmm..
If I remember right, that place is based in the main Reddit roguelike thread, and most (all?) of the games they have channels for are ones that are listed as Major or Popular roguelikes. Demon hasn't earned that distinction in the Reddit thread, which I strongly suspect is a pre-req for getting them to make a channel for it in the Discord.
I could probably ask, but... if I'm being honest, I'm not sure even I can make the case for Demon there just yet. The size of the player base is slowly increasing... but only slowly, and it is still pretty small even by roguelike standards. The only times Demon is ever mentioned on the reddit at all in stray comments made in this post or that post, so I feel like it'd be asking a bit much to elevate Demon to "Popular"... and it certainly isn't "Major" either
Anyway, I think I'd rather wait until we're a bit bigger before I ask the main Reddit and/or its Discord about adding Demon to the list.
I think the time *will* come, but I wanna wait until I'm more certain it will work. If I ask and am declined, it may be more difficult to get it done later.