It's possible it was a genuine spam campaign advertising potenzmittelapotheke24.de, sourced by some inexperienced spammer. But the sheer volume of spam advertising a single domain is one of the things that always makes me suspicious. Real spammers very seldom do things like that, simply because they don't want their domains shut down. They use redirectors, register dozens of new domains every day etc., and mostly use each (advertised) domain for one or two spam runs only.
Of course you know all this already, probably better than I do. But it would be too easy to think that joe jobbers are stupid in that the volume of spam makes it easier to distinguish joe jobs from real spam. They simply see that it works: there are always enough anti-spammers who are not equal to the occasion and complain about those sites anyway. And the more spam the more complaints. It doesn't matter if there are a few of us seeing what's going on, the math works for them.
I'm not sad either when I see one of these clearly criminal domains getting suspended. But the phenomenon itself is quite disturbing, since they can essentially use it against any domain they want, and I haven't figured out what we could do about it. No wonder the method has slowly become more and more popular.
Basically just waffling here...