> Are you working with the OP or is this different?
It is a separate server.
> I wasn't sure how discord works.
Discord (https://discord.com) allows a user to create a "server" for a topic of interest. Other discord users can then join the server. The admins of the server can create multiple channel for discussing sub-topics.
> The OP posted a discord username, not a different channel (I think)
Yes, you are right. OP posted his/her username. Whereas I posted a discord server link. You can join the server by creating a discord account on https://discord.com
By the name of the server this seems to be at least unofficially associated with YC? Is this primarily for projects backed by YC or just commercial projects?
It is for people who are working on side-projects, startups and or want to build a startup. It is open for everyone. It is to help each other as well as find someone to work with on a project.