I believe you are reading into it way too literally. All I see is that it's about mixers, which is a specific service as per the OP.
Maybe, I could be wrong, but remember this talk we had, and let's see what is going to happen in few months.
Isn't that similar to being allowed to discuss the effects of drugs, but not where to buy them?
Difference is that nowhere in the rules you can find that we can't speak about drugs, and that is not the case here with mixers.