Re: Well, I'm doing SOMETHING wrong, I can tell you that much
I would use the Hidden Forums plugin.
For the meta tags, since bbPress tries to use XHTML 1.1 strict, you should make those lowercase and self-closed:
<meta name="robots" content="noindex, nofollow" />
<meta http-equiv="cache-control" content="no-cache" />
<meta http-equiv="pragma" content="no-cache" />
Also, I’ve never heard of robots =none – read up on that to be sure you have it right. noindex, nofollow is how I’ve seen it.
The meta robots tag and the robots.txt just tell search engines that listen to not index the content. Some search engines still might index the content if they don’t obey the robots ‘standards’. So, you need to ensure the content is not visible to anyone unless that individual is logged in. I would use hidden forums for that. Or password protect the whole installation, like an intranet, and give everyone in your group that login.