Yea, the Red Tuepfel shrimp are very nice. And from the looks of it, I'd say that's what they are talking about. I might have the German version of the magazine somewhere and can look if they are talking about that particular variant.
Some time ago, I wanted to start a colony of RTS and I'd love to have some in the American hobby, so i went on the hunt. Problem was, I couldn't find any in the States. So I spoke with a lot of Germans and finally found someone who was willing to sell me some. However, the problem is that no one in Germany really keeps them and the gene pool has consequently shrunk down quite a bit. The breeder assured me with little transport time, a healthy set up and adequate quarantining measures that I would be able to start my colony. But the first point was almost impossible to achieve since I live in the States. After we started talking a bit he did mention that he has experienced issues with the colony. They are very fragile, do not take change well at all and are susceptible to diseases. He said that he has them in several designated tanks, just to prevent the whole colony to wipe out when several shrimp get sick. They are the same species as the tangerine tigers/aura blue and were just a random red mutation. But the mutation appears to be very rare, thus you rarely get new genes into the pool. Kind of sad that most likely they will disappear from the hobby in the future. Maybe, we can all help together to establish them in this hobby, or hope for more random red mutations out of C. serrata.
Apart from that if you want some more info on the specs I can try and see if I can dig up the email.