Yes, the forums used to be on the astraldynamics.com domain, or, rather, on a subdomain, but earlier in the year he moved them to a new domain for technical reasons, and also to use the .com domain focussed mostly on his business.
But the forums are entirely ad-free, and free to use, and have some pretty interesting people there. Much smaller than these forums, much more intimate environment, much smaller moderation team, and somewhat more specific and esoteric subject matter.
They forums are also on a dedicated server (despite being a small community, they get a fair bit of traffic), and they use the same base software as the PDSP forums, that is, vBulletin.
Quite some years ago, I think Robert was a co-owner of another astral-travel type forum, and that may have been Astral Pulse, but that was before my time, so I don't know any details. The Astral Dynamics forums have been online since 2005. (I've been there since 2007, which is why I don't know the full backstory of their creation.)