I didn't see the post referred to, but they had a list of rules for the group. The last one was this:
"No Expansion Talks:
We get it; you’re bored. Or panicked. It’s fun to speculate who else should come into the new conference, but expansion talk when the new members haven’t been even started is baseless and unnecessary. Keep it off the page in all ways, shapes or forms unless there are official reports that it’s actually happening."