The question, in question asks about:
Apparently, Baen's Bar, a popular and long-running "virtual convention" for sci-fi aficionados.
Baen's Bar is a forum, calling it a long-running virtual convention is overly generous.
As such, it's only tangentially on-topic. See this previous question, (the second linked in the main post) it also applies:
In the context of this question, the key phrase is "about science fiction or fantasy". This means Questions about motivation, influences and writing/acting styles would on topic. Questions about what they do in their personal lives, unless it can be specifically linked to a work of SF&F, should be off topic.
I don't think the question about the forum can be specifically linked to a work of SF&F. If the question had been about the delay of a book being published, or something more closely tied to SF&F, then it may have had a chance.
Again, the question discussed in the first meta post linked:
Into which house was Rowling sorted?
Ties directly into the Harry Potter fandom; understanding which house she is sorted into informs you about the work in question.
But questions about a forum itself, is like asking about the web technology behind Pottermore or the convention building itself. It looks like out pottermore and convention (common co-tags with fandom bear this out, as they're more directly linked to the works in question.
For instance Why was the old Pottermore shut down?, is on topic as the website directly relates parts of the harry potter franchise. Baen's Bar is just for the discussion of the works in question.
There will be questions that involve Baen's Bar in the future, but this one is not it.
In conclusion, the question isn't directly tied to a sci-fi or fantasy work, so it should not be left open.