This article repeats some misconceptions.
-Although elephants don't breed in zoos as well as giraffes or most mammals, not many are kept and are long lived, so very few elephants are actually imported. Asian elephants are domestic elephants or retired circus animals, not wild ones. Only African elephants come from the wild, mostly calves from culls in overpopulated national parks. They would be dead otherwise. Grand total is only 1-5 elephants per year for all Europe in the last decade.
-Zoos help elephants in the wild by funding and expertise for national parks, reserves, and plans in situ. For the funds to come, there must be zoo visitors interested in animals. Breeding animals for release in the wild is not the most common goal for zoos anymore. Every larger zoo supports some campaign or program for in situ conservation.
The German journalist could ask some conservation organizations affiliated with German zoos, like Cologne or Zoologische Gesellschaft Frankfurt, what programs they run in Asian and African reserves. It would be far more interesting read!
Maybe somebody on zoochat can tell details: when last time an Asian elephant was captured in the wild for European zoo? And how many elephants imported to Europe in the last 10 years came from the wild?