Yes, the admin's clarification can clarify whether services like Jambler are included in the prohibited category or not.
It looks like a "NO" according to theymos's post, although he said
probably and the user who ask it mentioned URL link(s).
Would it be OK to have a signature linking to a blog/article explaining what mixing is, how it works and containing URL link(s) to mixer(s)?
It'd be OK in a post. In a signature it would probably not be allowed, as it would look like "promoting a mixer".
I check on Jambler site,
there's a page that containing mixers URLs. What I think is, if Jambler only mention the domain names without hyperlinks, does it still fall to "promoting a mixer" or it's allowed?
Maybe a better question "theymos, can you tell us what's the way promote a site related to mixers in this forum after the restrictions?"

because many users are still trying to figure out to find a loophole from your rules.
