Yeah, No… the page I saw is located here: Welcome to the SuperCollider Forum and I don’t see the public slack invite mentioned anywhere on it!
Anyways, Thanks! I will join! I am an enthusiastic SC newbie! 
and I have LOTS of questions… Especially getting it to route audio to my DAW… I STILL have not succeeded! I haven’t figured out if that is because I’m just a lowly windows 10 user!