Yeah, could be. As I have seen from my couple of engagements there, it is open for everyone who has a startup and those who want to join a startup. There are both for rookies as well as experienced founders.

I don't know how much effect it has on the quality of the community, but I think it would be wrong(and could even be administratively overwhelming to manage that unless it is a paid forum) to exclude people who are new to the startup world.