I would assume that the rules are intended to prevent non-trusted members from soliciting business, and also to limit the "pool" of potential members subjected to having their issues adjudicated in the Shitlist Thread section to only those that have been approved by Forum Staff.
Since you didn't solicit them, and they found you instead, not only do I think it's "legal", but I also think that it would be impossible to do it otherwise. What you could do, what I have done in the past, is to move all inquiries that might be in the least bit questionable off the forum and onto a Skype chat.